Edward Tomasz Napierała
2019-Aug-25 12:19 UTC
[FreeBSD-Announce] FreeBSD Quarterly Status Report - Second Quarter 2019
FreeBSD Project Quarterly Status Report - 2nd Quarter 2019
This quarter our report includes some interesting topics easily
accessible to anyone, even if you are not a programmer: we report the
link to a presentation of the 2019 FreeBSD survey results at BSDCan
2019 and describe an interesting experience of a 3-person hackaton,
which might encourage you to host one yourself, possibly with more
participants. We also provide some up to date information about the
status of our IRC channels.
For those who have some more technical skills, we give some news about
the role of git in the FreeBSD project, describe the status of some
tools to hunt bugs or enhance security and announce a clone of sysctl.
Finally, those who are more experienced with programming will probably
be interested in the great work that has been done with drivers: in
particular, an aknowledgement is due to Alan Somers for having started
to bring up to date our FUSE implementation, which was about 11 years
behind. Other important improvements include a more user-friendly
experience with trackpoints and touchpads enabled by default, much low
level work on graphics, many new bhyve features, updates to the linux
compatibility layer, various kernel improvements.
Have a nice read!
-- Lorenzo Salvadore
__________________________________________________________________
FreeBSD Team Reports
* Continuous Integration
* FreeBSD Core Team
* FreeBSD Graphics Team status report
* IRC Admin
* Ports Collection
* Release Engineering Team
Projects
* bhyve - Live Migration
* bhyve - Save/Restore
* BIO_DELETE support for the swap pager
* ENA FreeBSD Driver Update
* FreeBSD SDIO and Broadcom FullMAC WiFi Support
* FUSE
* Fuzzing FreeBSD with syzkaller
* Kernel ZLIB Update
* Linux compatibility layer update
* Lock-less delayed invalidation for amd64 pmap
* Locking changes for vnodes during execve(2)
* Mellanox Drivers Update
* NFSv4.2 client/server implementation for FreeBSD
* NUMA awareness in the FreeBSD kernel
Architectures
* Broadcom ARM64 SoC support
* NXP ARM64 SoC support
Third-Party Projects
* Aberdeen Hackathon
* Bring more Security Intelligence to FreeBSD
* libvdsk - QCOW2 implementation
* nsysctl 1.0
__________________________________________________________________
FreeBSD Team Reports
Entries from the various official and semi-official teams, as found in
the Administration Page.
Continuous Integration
Links
FreeBSD Jenkins Instance
URL: https://ci.FreeBSD.org
FreeBSD CI artifact archive
URL: https://artifact.ci.FreeBSD.org/
FreeBSD Jenkins wiki
URL: https://wiki.freebsd.org/Jenkins
freebsd-testing Mailing List
URL: https://lists.FreeBSD.org/mailman/listinfo/freebsd-testing
freebsd-ci Repository
URL: https://github.com/freebsd/freebsd-ci
Tickets related to freebsd-testing@
URL: https://preview.tinyurl.com/y9maauwg
Hosted CI wiki
URL: https://wiki.freebsd.org/HostedCI
FreeBSD CI weekly report
URL: https://hackfoldr.org/freebsd-ci-report/
Contact: Jenkins Admin <jenkins-admin at FreeBSD.org>
Contact: Li-Wen Hsu <lwhsu at FreeBSD.org>
The FreeBSD CI team maintains continuous integration system and related
tasks for the FreeBSD project. The CI system regularly checks the
committed changes can be successfully built, then performs various
tests and analysis of the results. The results from build jobs are
archived in an artifact server, for the further testing and debugging
needs. The CI team members examine the failing builds and unstable
tests, and work with the experts in that area to fix the code or adjust
test infrastructure. The details are of these efforts are available in
the weekly CI reports.
The FCP for CI policy is in "feedback" state, please provide any
comments to freebsd-testing@ or other suitable lists.
We had a testing working group in 201905 DevSummit
Please see freebsd-testing@ related tickets for more information.
Work in progress:
* Fixing the failing test cases and builds
* Adding drm ports building test against -CURRENT
* Adding powerpc64 tests job:
https://github.com/freebsd/freebsd-ci/pull/33
* Implementing automatic tests on bare metal hardware
* Extending and publishing the embedded testbed
* Planning for running ztest and network stack tests
* Help more 3rd software get CI on FreeBSD through a hosted CI
solution
__________________________________________________________________
FreeBSD Core Team
Contact: FreeBSD Core Team <core at FreeBSD.org>
The FreeBSD Core Team is the governing body of FreeBSD.
* Core approved source commit bits for Doug Moore (dougm), Chuck
Silvers (chs), Brandon Bergren (bdragon), and a vendor commit bit
for Scott Phillips (scottph).
* The annual developer survey closed on 2019-04-02. Of the 397
developers, 243 took the survey with an average completion time of
12 minutes. The public survey closed on 2019-05-13. It was taken by
3637 users and had a 79% completion rate. A presentation of the
survey results took place at BSDCan 2019.
* The core team voted to appoint a working group to explore
transitioning our source code 'source of truth' from Subversion
to
Git. Core asked Ed Maste to chair the group as Ed has been
researching this topic for some time. For example, Ed gave a
MeetBSD 2018 talk on the topic.
There is a variety of viewpoints within core regarding where and how to
host a Git repository, however core feels that Git is the prudent path
forward.
* The project received many Season of Docs submissions and picked a
top candidate. Google will announce the accepted technical writer
projects on 2019-08-06. We are hoping for lots of new and refreshed
man pages.
__________________________________________________________________
FreeBSD Graphics Team status report
Links
Project GitHub page
URL: https://github.com/FreeBSDDesktop
Contact: FreeBSD Graphics Team <x11 at freebsd.org>
Contact: Niclas Zeising <zeising at freebsd.org>
The FreeBSD X11/Graphics team maintains the lower levels of the FreeBSD
graphics stack. This includes graphics drivers, graphics libraries such
as the MESA OpenGL implementation, the X.org xserver with related
libraries and applications, and Wayland with related libraries and
applications.
In the last report, half a year ago, several updates and changes had
been made to the FreeBSD graphics stack.
To further improve the user experience, and to improve input device
handling, evdev was enabled in the default configuration in late 2018.
Building on that, we have enabled IBM/Lenovo trackpoints and elantech
and synaptics touchpads by default as well.
The input device library libinput has been updated as the last in a
series of updates bringing the userland input stack up to date. This is
work that was started in 2018.
We have made several improvements to the drm kernel drivers. A
long-standing memory leak in the Intel (i915) driver has been fixed,
and several other updates and improvements have been made to the
various drm kernel driver components.
A port of the drm kernel drivers using the 5.0 Linux kernel sources has
been created and committed to FreeBSD ports as graphics/drm-devel-kmod.
This driver requires a recent Linux KPI and is only available on recent
versions of FreeBSD CURRENT.
This version of the driver contains several development improvements.
The generic drm (drm.ko) driver as well as the i915 (i915kms.ko) driver
can now be unloaded and reloaded to ease in development and testing.
This causes issues with the virtual consoles, however, so an SSH
connection is recommended. To aid debugging i915kms.ko use of debugfs
has been improved, but there are still limitations preventing it from
being fully functional. Since debugfs is based on pseudofs it is
possible that this will prevent a fully functional debugfs in its
current state, so we might have to look into adding the required
functionality to pseudofs or use another framework.
The new in-kernel drm driver for VirtualBox, vboxvideo.ko has been
ported from Linux. Support is currently an experimental work in
progress. For example the virtual console won't update after loading
the driver, but X- and Wayland-based compositors are working.
Mesa has been updated to 18.3.2 and switched from using devel/llvm60 to
use the Ports default version of llvm, currently devel/llvm80.
Several userland Xorg drivers, applications, and libraries have been
updated, and other improvements to the various userland components that
make up the Graphics Stack have been made.
We have also continued our regularly scheduled bi-weekly meetings,
although work remains in sending out timely meeting minutes afterwards.
People who are interested in helping out can find us on the
x11 at FreeBSD.org mailing list, or on our gitter chat:
https://gitter.im/FreeBSDDesktop/Lobby. We are also available in
#freebsd-xorg on EFNet.
We also have a team area on GitHub where our work repositories can be
found: https://github.com/FreeBSDDesktop
__________________________________________________________________
IRC Admin
Contact: IRC Admin <irc at FreeBSD.org>
The FreeBSD IRC Admin team manages the FreeBSD Project's presence and
activity on the freenode IRC network, looking after:
* Registration and management of channels within the official
namespace (#freebsd*)
* Channel moderation
* Liaising with freenode staff
* Allocating freebsd/* hostmask cloaks for users
* General user support relating to channel management
While the FreeBSD Project does not currently endorse IRC as an official
support channel (see here and here), as it has not been able to
guarantee a consistent or positive user experience, IRC Admin has been
working toward creating a high quality experience, by standardising
channel administration and moderation expectations, and ensuring the
projects ability to manage all channels within its namespace.
In the last quarter, IRC Admin:
* Cleaned up (deregistered) registrations for channels that were
defunct, stale, out of date, or had founders that were inactive
(not seen for > 1 year). Channels that were found to be otherwise
active have been retained. FreeBSD now has ~40 channels registered
from a previous total of over 150.
* Documented baseline configuration settings in the Wiki for
channels, including ChanServ settings, channel modes, registration
policy, etc.
* Established multiple documented methods for reporting user abuse or
other channel issues to IRC Admin for resolution
Upcoming changes:
* Work with existing #freebsd* channels to standardise channel
management, settings and access.
* Migrate, forward and/or consolidate existing or duplicate #freebsd*
channels to channels with a standard naming convention.
* Work with unofficial ##freebsd* channels to migrate them to the
official #freebsd* channels if suitable
* Update existing IRC-related website and documentation sources the
describe the official state of project managed IRC presence on
freenode.
Lastly, and to repeat a previous call, while the vast majority of the
broader user community interacts on the freenode IRC network, the
FreeBSD developer presence still needs to be significantly improved on
freenode.
There are many opportunities to be had by increasing the amount and
quality of interaction between FreeBSD users and developers, both in
terms of developers keeping their finger on the pulse of the community
and in encouraging and cultivating greater contributions to the Project
over the long term.
It is critical to have a strong developer presence amongst users, and
IRC Admin would like again to call on all developers to join the
FreeBSD freenode channels to increase that presence.
Users are invited to /join #freebsd-irc on the freenode IRC network if
they have questions, ideas, constructive criticism, and feedback on how
the FreeBSD Project can improve the service and experience it provides
to the community on IRC.
__________________________________________________________________
Ports Collection
Links
About FreeBSD Ports
URL: https://www.FreeBSD.org/ports/
Contributing to Ports
URL:
https://www.freebsd.org/doc/en_US.ISO8859-1/articles/contributing/ports-contributing.html
FreeBSD Ports Monitoring
URL: http://portsmon.freebsd.org/index.html
Ports Management Team:
URL: https://www.freebsd.org/portmgr/index.html
Contact: Ren? Ladan <portmgr-secretary at FreeBSD.org>
Contact: FreeBSD Ports Management Team <portmgr at FreeBSD.org>
The following was done during the last quarter by portmgr to keep
things in the Ports Tree going:
During the last quarter the number of ports rose to just under 37,000.
At the end of the quarter, there were 2146 open PRs and 7837 commits
(excluding 499 on the quarterly branch) from 172 committers. This shows
a slight decrease in activity compared to previous quarter.
People come and go, last quarter we welcomed Pedro Giffuni (pfg@),
Piotr Kubaj (pkubaj@) and Hans Petter Selasky (hselasky@). Pedro and
Hans Petter were already active as src committers. We said goodbye to
gordon@, kan@, tobez@, and wosch at .
On the infrastructure side, a new USES=cabal was introduced and various
default versions were updated: MySQL to 5.7, Python to 3.6, Ruby to
2.5, Samba to 4.8 and Julia gained a default version of 1.0. The web
browsers were also updated: Firefox to 68.0 and Chromium to
75.0.3770.100
During the last quarter, antoine@ ran a total of 41 exp-runs to test
various package updates, bump the stack protector level to
"strong",
switch the default Python version to 3.6 as opposed to 2.7, remove
sys/dir.h from base which has been deprecated for over 20 years, and
convert all Go ports to USES=go.
__________________________________________________________________
Release Engineering Team
Links
FreeBSD 11.3-RELEASE schedule
URL: https://www.freebsd.org/releases/11.3R/schedule.html
FreeBSD 11.3-RELEASE announcement
URL: https://www.freebsd.org/releases/11.3R/announce.html
FreeBSD 12.1-RELEASE schedule
URL: https://www.freebsd.org/releases/12.1R/schedule.html
FreeBSD development snapshots
URL: https://download.freebsd.org/ftp/snapshots/ISO-IMAGES/
Contact: FreeBSD Release Engineering Team <re at FreeBSD.org>
The FreeBSD Release Engineering Team is responsible for setting and
publishing release schedules for official project releases of FreeBSD,
announcing code freezes and maintaining the respective branches, among
other things.
During the second quarter of 2019, the FreeBSD Release Engineering team
started the 11.3-RELEASE cycle, with the code slush starting May 3rd.
Throughout the cycle, there were three BETA builds and three RC builds,
all of which in line with the originally-published schedule. The final
RC build started June 28th, with the final release build targeted for
July 5th.
FreeBSD 11.3-RELEASE will be the fourth release from the stable/11
branch, building on the stability and reliability of 11.2-RELEASE.
The FreeBSD Release Engineering Team also published the schedule for
the 12.1-RELEASE, targeted to start September 6th. One important thing
to note regarding the published schedule is it excludes a hard freeze
on the stable/12 branch, as a test run for eliminating code freezes
entirely during a release cycle. Commits to what will be the
releng/12.1 branch will still require explicit approval from the
Release Engineering Team, however.
Additionally throughout the quarter, several development snapshots
builds were released for the head, stable/12, and stable/11 branches.
Much of this work was sponsored by the FreeBSD Foundation and Rubicon
Communications, LLC (Netgate).
__________________________________________________________________
Projects
Projects that span multiple categories, from the kernel and userspace
to the Ports Collection or external projects.
bhyve - Live Migration
Links
Github wiki - How to Live and Warm Migrate a bhyve guest
URL:
https://github.com/FreeBSD-UPB/freebsd/wiki/Virtual-Machine-Migration-using-bhyve
Github - Warm Migration branch
URL: https://github.com/FreeBSD-UPB/freebsd/tree/projects/bhyve_migration
Github - Live Migration branch
URL:
https://github.com/FreeBSD-UPB/freebsd/tree/projects/bhyve_migration_dev
Contact: Elena Mihailescu <elenamihailescu22 at gmail.com>
Contact: Darius Mihai <dariusmihaim at gmail.com>
Contact: Mihai Carabas <mihai at freebsd.org>
The Migration feature uses the Save/Restore feature to migrate a bhyve
guest from a FreeBSD host to another FreeBSD host. To migrate a bhyve
guest, one needs to start an empty guest on the destination host from a
shared guest image using the bhyve tool with the -R option followed by
the source host IP and the port to listen to migration request. On the
source host, the migration is started by executing the bhyvectl command
with the --migrate or --migrate-live option, followed by the
destination host IP and the port to send to the messages.
New features added:
* Clear the dirty bit after each migration round
* Extend live migration to highmem segment
Future tasks:
* Refactor live migration branch
* Rebase live migration
* Extend live migration to unwired memory
This project was sponsored by Matthew Grooms.
__________________________________________________________________
bhyve - Save/Restore
Links
Github repository for the snapshot feature for bhyve
URL: https://github.com/FreeBSD-UPB/freebsd/tree/projects/bhyve_snapshot
Github wiki - How to Save and Restore a bhyve guest
URL:
https://github.com/FreeBSD-UPB/freebsd/wiki/Save-and-Restore-a-virtual-machine-using-bhyve
Github wiki - Suspend/resume test matrix
URL: https://github.com/FreeBSD-UPB/freebsd/wiki/Suspend-Resume-test-matrix
Phabricator review - bhyve Snapshot Save and Restore
URL: https://reviews.freebsd.org/D19495
Contact: Elena Mihailescu <elenamihailescu22 at gmail.com>
Contact: Darius Mihai <dariusmihaim at gmail.com>
Contact: Mihai Carabas <mihai at freebsd.org>
The Save/Restore for bhyve feature is a suspend and resume facility
added to the FreeBSD/amd64's hypervisor, bhyve. The bhyvectl tool is
used to save the guest state in three files (a file for the guest
memory, a file for the states of various devices and the state of the
CPU, and another one for some metadata that is used in the restore
process). To suspend a bhyve guest, the bhyvectl tool must be run with
the --suspend <state_file_name> option followed by the guest name.
To restore a bhyve guest from a checkpoint, one simply has to add the
-r option followed by the main state file (the same file that was given
to the --suspend option for bhyvectl) when starting the VM.
New features added:
* Open ticket on Phabricator
* Apply feedback received from community
Future tasks:
* Add suspend/resume support for nvme
* Add suspend/resume support for virtio-console
* Add suspend/resume support for virtio-scsi
* Add TSC offsetting for restore for AMD CPUs
This project was sponsored by Matthew Grooms.
__________________________________________________________________
BIO_DELETE support for the swap pager
Contact: Doug Moore <dougm at FreeBSD.org>
Contact: Alan Cox <alc at FreeBSD.org>
Contact: Mark Johnston <markj at FreeBSD.org>
An ongoing project aims to teach the swap pager to send SCSI UNMAP or
ATA TRIM commands to the swap device when a block of swap space has
been freed, for example when the application owning that block is
exiting.
SSDs have become commonplace and feature low latency for random I/O
requests. This makes them appealing for use as swap devices, since
lower latencies mean that applications spend less time blocked while
waiting for a page-in from the swap device. To maximize write
performance, some SSDs require the operating system to send a
notification to the disk when a sector is no longer in use; this helps
the disk optimize their usage of NAND flash cells. In FreeBSD such a
notification is called a BIO_DELETE.
FreeBSD's UFS and ZFS filesystems have for a long time been able to
transmit BIO_DELETE requests to the devices backing the filesystem. For
example, for UFS this support is enabled by specifying -t in newfs(8)
or tunefs(8)'s parameters. However, FreeBSD has historically not had a
corresponding implementation for swap devices.
Thanks to Doug Moore, as of r349286 in -CURRENT and r349930 in
stable/12 swapon(8) can send BIO_DELETE to all blocks on the specified
device immediately prior to configuring it as a swap device. This is
enabled by specifying -E in the swapon(8) parameters, or by adding the
"trimonce" option to the swap device's /etc/fstab entry. Some
in-progress work on the swap pager implements online block deletion, in
which BIO_DELETE is transmitted for blocks as they are freed by
applications; this will hopefully be implemented in FreeBSD 13.0.
__________________________________________________________________
ENA FreeBSD Driver Update
Links
ENA README
URL: https://github.com/amzn/amzn-drivers/blob/master/kernel/fbsd/ena/README
Contact: Michal Krawczyk <mk at semihalf.com>
Contact: Maciej Bielski <mba at semihalf.com>
Contact: Marcin Wojtas <mw at semihalf.com>
ENA (Elastic Network Adapter) is the smart NIC available in the
virtualized environment of Amazon Web Services (AWS). The ENA driver
supports multiple transmit and receive queues and can handle up to 100
Gb/s of network traffic, depending on the instance type on which it is
used.
ENAv2 has been under development for FreeBSD, similar to Linux and
DPDK. Since the last update internal review and improvements of the
patches were done, followed by validation on various AWS instances.
Completed since the last update:
* Upstream of the ENAv2 patches - revisions r348383 - r348416
introduce a major driver upgrade to version v2.0.0. Along with
various fixes and improvements, the most significant features are
LLQ (Low Latency Queues) and independent queues reconfiguration
using sysctl commands.
* Implement NETMAP support for ENA
Todo:
* Internal review and upstream of NETMAP support
This project was sponsored by Amazon.com Inc.
__________________________________________________________________
FreeBSD SDIO and Broadcom FullMAC WiFi Support
Links
FreeBSD Wiki SDIO page
URL: https://wiki.freebsd.org/SDIO
Contact: Bjoern Zeeb <bz at FreeBSD.ORG>
SDIO is an interface designed as an extension to SD Cards to allow
attachments of various other peripherals, e.g., WiFi or Bluetooth.
Work has been ongoing by Ilya Bakulin on the MMCCAM stack to provide
the infrastructure to be able to have SD cards and SDIO devices
attached side-by-side facilitating FreeBSD's CAM framework. Based on
this excellent work over the last years, SDIO support was finished
earlier this year and committed to FreeBSD HEAD with the intention to
merge to 12 at a later time.
Facilitating the newly available SDIO bus, work started to port
Broadcom's FullMAC WiFi driver. This work is still in progress and
expected to complete later this year. With this WiFi support for the
Raspberry Pi and other embedded boards will become available. Likewise
drivers for other SDIO devices can be developed now.
This project was sponsored by The FreeBSD Foundation.
__________________________________________________________________
FUSE
Contact: Alan Somers <asomers at FreeBSD.org>
FUSE (File system in USErspace) allows a userspace program to implement
a file system. It is widely used to support out-of-tree file systems
like NTFS, as well as for exotic pseudo file systems like sshfs.
FreeBSD's fuse driver was added as a GSoC project in 2012. Since that
time, it has been largely neglected. The FUSE software is buggy and
out-of-date. Our implementation is about 11 years behind.
During Q2 I nearly finished the FUSE overhaul that I begain in Q1. I
raised the protocol level from 7.8 to 7.23, fixed many bugs (see
199934, 216391, 233783, 234581, 235773, 235774, 235775, 236226, 236231,
236236, 239291, 236329, 236379, 236381, 236405, 236327, 236466, 236472,
236473, 236474, 236530, 236557, 236560, 236647, 236844, 237052, 237181,
237588, and 238565), and added the following features:
* Optional kernel-side permissions checks (`-o default_permissions`)
* Implement VOP_MKNOD, VOP_BMAP, and VOP_ADVLOCK
* Allow interrupting FUSE operations
* Support named pipes and unix-domain sockets in fusefs file systems
* Forward UTIME_NOW during utimensat(2) to the daemon
* kqueue support for /dev/fuse
* Allow updating mounts with mount -u
* Allow exporting fusefs file systems over NFS
* Server-initiated invalidation of the name cache or data cache
* Respect RLIMIT_FSIZE
* Try to support servers as old as protocol 7.4
I also added the following performance enhancements:
* Implement FUSE's FOPEN_KEEP_CACHE and FUSE_ASYNC_READ flags
* Cache file attributes
* Cache lookup entries, both positive and negative
* Server-selectable cache modes: writethrough, writeback, or uncached
* Write clustering
* Readahead
* Use counter(9) for statistical reporting
All that remains is to finish merging the branch, and deal with any
newly introduced bugs.
This project was sponsored by The FreeBSD Foundation.
__________________________________________________________________
Fuzzing FreeBSD with syzkaller
Links
syzkaller
URL: https://github.com/google/syzkaller
Contact: Mark Johnston <markj at FreeBSD.org>
Contact: Andrew Turner <andrew at FreeBSD.org>
Contact: Michael Tuexen <tuexen at FreeBSD.org>
Contact: Ed Maste <emaste at FreeBSD.org>
See the syzkaller entry in the 2019q1 quarterly report for an
introduction to syzkaller.
syzkaller continues to find FreeBSD kernel bugs. A number of such bugs
have been fixed in the past quarter, and we continue to investigate and
fix bug reports from syzkaller. Work to extend syzkaller's capabilites
has progressed: Andrew Turner has implemented support for fuzzing the
32-bit compatibility layer in amd64 kernels, helping illuminate some of
the darker corners of the kernel, and it is now possible to use bhyve
as a VM backend to syzkaller, so it is now efficient and convenient to
fuzz FreeBSD on FreeBSD.
Some planned work includes: enabling the use of ZFS as the base
filesystem for fuzzer VMs; extending the range of system calls and
ioctls covered by syzkaller; enabling LLVM sanitizers in the kernel so
as to catch more issues; and making use of netdump(4) to capture kernel
dumps for panics found by syzkaller, making it much easier to diagnose
bugs for which syzkaller was unable to find a reproducible test case.
This project was sponsored by The FreeBSD Foundation.
__________________________________________________________________
Kernel ZLIB Update
Links
Review D19706
URL: https://reviews.freebsd.org/D19706
Contact: Yoshihiro Ota <ota at j.email.ne.jp>
Kernel zlib upgrade is in progress.
Xin (delphij@) and I have been working closely for zlib upgrade. We
relocated contrib/zlib to sys/contrib/zlib in order for kernel code to
access zlib in the tree. We also deleted dead code that depended on
zlib and inflate - inflate is a fork of unzip to uncompress gzip files.
We also renamed crc.h to avoid conflicts with zlib/crc.h.
Next goal is to compile both old zlib and new zlib into the kernel
allowing to switch each zlib user independently.
__________________________________________________________________
Linux compatibility layer update
Contact: Edward Tomasz Napierala <trasz at FreeBSD.org>
The project aims to improve the Linux compatibility layer, to make it
more compatible with recent Linux releases, and also to lower the bar
for potential developers who want to start contributing to it.
The initial effort focused on tooling, to make it easier to debug
problems and to prevent future regressions. The first part involved
making it possible to use Linux strace(1) utility and providing it as
linux-c7-strace package. The reason is that while FreeBSD truss(1) and
ktrace(1) can trace Linux binaries, they cannot decode Linux-specific
flags and structures.
The second part involved providing Linux Test Project binaries as
linux-ltp package. There is ongoing work to hook it up to the FreeBSD
CI infrastructure http://ci.FreeBSD.org.
There was also a number of improvements and fixes to bugs discovered in
the process. One of them (not yet committed) fixes binaries linked
against newer version of libc, effectively unbreaking binaries from
recent Ubuntu releases.
This project was sponsored by FreeBSD Foundation.
__________________________________________________________________
Lock-less delayed invalidation for amd64 pmap
Contact: Konstantin Belousov <kib at freebsd.org>
The Virtual Memory machine-dependent layer (pmap) on amd64 needs to
track all mappings for the managed physical memory pages, to be able to
either destroy all of them (for page-out), or change them from
writeable to read-only (e.g. to sync the page content to file, without
racing with modifications through user writes). The mappings are
accounted by creating pv_entry which records the address space
(implicitly, by linking the pv entry to pmap) and the virtual address
of the mapping.
Previous work split the lock protecting the pv entries lists from other
VM locks into the pvh_global_lock lock, which was global for all
address spaces. You can see it in i386 pmap.c still. Later, hashed
per-page pv lists locks were introduced, which would reduce contention
on pv lists maninulations for different pages, but unfortunately the
pvh_global_lock was still needed to guarantee the safety of some
operations.
Problem arises because amd64 pmap uses pmap lock to protect page tables
and TLB consistency, which is per-pmap locks different from pv lists
locks. When updating page table entry, we never drop pmap lock until
the necessary TLB invalidation is done globally, including signalling
other CPUs with IPI. But pv list locks can be unlocked before the
necessary invalidation is done. So for instance when pmap is asked to
remove all mappings of the specific page (pmap_remove_all(9)), it
checks pv list of the page to find the mappings. The list might appear
empty despite other CPUs TLB were not yet invalidated. If such page is
reused, other CPUs might change its content using cached TLB entries.
Allowing that means allowing both silent data corruption and opening
security hole.
So the global pvh lock was held until all pmaps invalidated their TLBs.
This mechanism has obvious scalability issues, and instead a
generation-count based scheme for handling delayed invalidation (DI)
was developed, where each thread that might remove entry from pv list
acquired a generation number and marked the page with it, see
pmap_delayed_invl_page(9). Then, on e.g. pmap_remove_all(9) or
pmap_remove_write(9), pmap code waits for the maximum current thread's
invalidation generation number to pass the page's generation, which
guarantees that all required TLB invalidations are done.
Original implementation of DI allowed to get rid of pvh_global_lock,
and only used a private mutex to handle sequential queueing of the
coming and leaving threads, protecting a bounded region. A problem with
that appeared e.g. in scalability benchmarks which did massive parallel
unmaps, causing most of the threads to contend on DI queueing.
Current implementation of DI switched to lock-less queue algorithm
using the approach proposed by T.L. Harris and relying on double-CAS to
coalesce generation count and queueing. It uses ifuncs to select either
previous locked DI or current lock-less implementation, only old AMD
Athlons which did not implemented the CMPXCHG16B instruction falls to
the locked implementation by default. Lock-less implementation still
blocks the waiting thread on turnstile to avoid priority-inversion
issues, but practically the wait occur very rare, typical parallel
buildworld generates single-digit number of the events.
The patch got a lot of testing from Peter Holm, continuous reviews by
Mark Johnston while I worked out bugs and live-lock problems in the
implementation, and additional testing by Mateusz Guzik who helped to
identify a priority inversion bug with the wait.
This project was sponsored by The FreeBSD Foundation.
__________________________________________________________________
Locking changes for vnodes during execve(2)
Contact: Konstantin Belousov <kib at freebsd.org>
The execve(2) family of syscalls replaces the executing image in the
current process. The file containing the program text, data, and
arbitrary other pre-initialized segments for the newly activated image
is usually called the text file. FreeBSD marks the text file as such,
the mark is mutually exclusive with any opening of the file for write.
In other words, file opened for write cannot be executed, and text file
cannot be opened for write.
During the execve(2) syscall processing, kernel needs to lock the text
file' vnode. This is done both to satisfy the VFS calls protocol, and
to ensure that there is no incompatible parallel changes occuring to
the text vnode. A vnode can be locked either in exclusive mode, which
is mutually incompatible with any other lock acquisition, or in shared
mode, which is only incompatible with exclusive requests, but allows
other shared owners.
In principle, there is no reason why would execve(2) need an exclusive
vnode lock, since it does not modify neither content nor metadata for
the text vnode. The only exception is the marking of the vnode as text,
which was done using VV_TEXT flag in v_vflag and protected by the vnode
lock. Since we modify v_vflag, the vnode lock protecting the
modification should be taken exclusive.
The end result is that execve(2)'s of the same file are serialized. For
instance, if user runs parallel build, which executes more than one job
for compiling, all invocation of the compiler are serialized during
execve(2).
The count of opens for write is contained in other struct vnode member
named v_writecount, which was protected by the vnode lock as well.
Since text is mutually exclusive with an open for write, I reused
v_writecount to indicate text references. Now, negative v_writecount
counts the number of text references. The v_writecount content is
literally protected by the vnode interlock, but normally all mutators
also own vnode lock at least in the shared mode.
This way, we no longer need to acquire exclusive text vnode lock during
execve(2), removing the serializing point. Additional positive effect
is that we started to account the precise number of text references on
the vnode. Before, we cleared VV_TEXT on the last unmap of the text
vnode, potentially allowing obscure DoS where mapping the text file
while it is executed prevented writes until the mapping is destroyed.
Now we mark the mappings for text explicitly in the vm_map_entry and
dereference v_writecount by +1 when such entry is unmapped.
This project was sponsored by The FreeBSD Foundation.
__________________________________________________________________
Mellanox Drivers Update
Links
Mellanox OFED for FreeBSD Documentation
URL:
http://www.mellanox.com/page/products_dyn?product_family=193&mtag=freebsd_driver
Contact: Slava Shwartsman Hans Petter Selasky Konstantin Belousov
<freebsd-drivers at mellanox.com>
The mlx5 driver provides support for ConnectX-4 [Lx], ConnectX-5 [Ex]
and ConnectX-6 [Dx] adapter cards. The mlx5en driver provides support
for Ethernet adapter cards, whereas mlx5ib driver provides support for
InfiniBand adapters and RDMA over Converged Ethernet (RoCE).
Following updates done in mlx5 drivers:
* 200Gb/s ConnectX-6 Ethernet: Added support for Mellanox Socket
Direct Adapters which allows, among the rest of the capabilities,
to run up to 200Gb/s on a PCIe Gen 3.0 on a LAG interface.
* Support for "BlueField" - Multicore System On A Chip: Added
support
for RShim driver for BlueField Multicore System On A Chip(SOC). The
RShim driver provides access to the RShim resources on the
BlueField target accessible from an external host machine. The
current RShim version provides device files for boot image push and
virtual console access. It also creates virtual network interface
to connect to the BlueField target and provides access to internal
RShim registers.
* Firmware Burning and Diagnostics Tools: Added MSTFLINT to ports,
this package contains a burning and diagnostic tools for Mellanox
NICs. This package contains following tools: mstflint - Tools which
allows to query and burn firmware. mstconfig - This tool queries
and sets non-volatile configurable options for Mellanox HCAs.
mstregdump - This utility dumps hardware registers from Mellanox
hardware. mstmcra - This debug utility reads/writes a to/from the
device configuration register space. mstvpd - This utility dumps
the on-card VPD. and more.
* OFED-FreeBSD-v3.5.1 Upstream: Pushed upstream and MFCed
OFED-FreeBSD-v3.5.1 driver - more details on the content of this
update can be found in Mellanox OFED for FreeBSD documentation
page.
General updates:
* Submitted papers for EuroBSDcon for a joint talk with Netflix
titled "Kernel TLS and TLS Hardware Offload". The papers were
accepted.
* Mellanox is intensively working to improve its cooperation with the
FreeBSD community. As part of this effort, FreeBSD users are
invited to propose features and enhancements to further develop and
enrich the end-user experience. In addition, Mellanox continues to
identify and present the right solutions to meet customers' needs.
This project was sponsored by Mellanox Technologies.
__________________________________________________________________
NFSv4.2 client/server implementation for FreeBSD
Links
current sources
URL: https://svnweb.freebsd.org/base/projects/nfsv42
Contact: Rick Macklem <rmacklem at freebsd.org>
NFSv4.2 is a newer minor version of NFSv4, made up of a set of optional
operations/features. A majority of these operations are related to the
POSIX operations posix_fadvise(2), posix_fallocate(2) and lseek(2)'s
support for SEEKHOLE/SEEKDATA. There is also a Copy operation that
allows a byte range of a file to be copied to another file locally on
the NFS server, avoiding data transfer over the wire in both
directions. FreeBSD-current now has a Linux compatible
copy_file_range(2) syscall that will invoke this Copy operation on
NFSv4.2 mounts. There is also support for MAC labelling, but it
requires changes to the RPCSEC_GSS implementation to add V3 support
and, as such, may not happen soon.
The implementation of NFSv4.2 (RFC-7862) is progressing nicely. At this
time, the LayoutError, IOAdvise, Allocate and Copy operations have been
implemented. There is still work to be done on Copy, to add
asynchronous support, so that large copies do not result in a long
delay for the RPC's reply.
The major operation that will be implemented next is Seek, so that
lseek(SEEKHOLE/SEEKDATA) will work for the NFSv4.2 mounts.
It is hoped that this implementation will be ready for
FreeBSD-current/head in time for the FreeBSD-13 release.
Testing is always appreciated and can be done by downloading the
modified kernel from the svn repository in base/rojects/nfsv42 and then
building and testing it on a couple of recent FreeBSD-current systems.
If anyone is conversant with Kerberos and wants to take on the
challenge of adding RPCSEC_GSS_V3 support to the kernel RPC, a patch
that does that would also be greatly appreciated.
__________________________________________________________________
NUMA awareness in the FreeBSD kernel
Contact: Jeff Roberson <jeff at FreeBSD.org>
Contact: Andrew Gallatin <gallatin at FreeBSD.org>
Contact: Mark Johnston <markj at FreeBSD.org>
A set of patches to improve the state of NUMA awareness in the FreeBSD
kernel are being developed and refined. This work also aims to
generally improve the performance of FreeBSD's memory management
subsystem on systems with many CPUs.
FreeBSD 12.0 featured a number of large changes which improve its
performance on systems with a non-uniform memory architecture. That is,
systems in which memory access latency for a given address varies
depending on the CPU. Another round of improvements is being developed
and will soon be available in FreeBSD-CURRENT. Short descriptions of
some of these patches follow; a few have already been committed to
FreeBSD-CURRENT.
In FreeBSD terminology, a memory page whose contents may not be evicted
is referred to as "wired." Pages may be wired under different
circumstances: for instance, all kernel memory is wired, and userland
applications may request that ranges of memory be wired using the
mlock(2) and mlockall(2) system calls. FreeBSD has historically defined
a system-wide limit on the number of wired pages so as to avoid
deadlocks that may arise when too much of a system's memory cannot be
reclaimed to satisfy new memory allocations. This limit was applied
only to userland wiring requests, but kernel wirings were counted
against the limit, so a large source of kernel wirings could cause
mlock(2) failures. This occurs frequently with a large ZFS ARC, for
example. In FreeBSD-CURRENT this limit has been changed such that only
userland wirings are counted against the limit; the kernel contains a
number of mechanisms to apply back-pressure to kernel memory usage, so
the use of a global limit on all wirings did not provide much benefit.
This fixes a common problem on large ZFS systems, and helps enable some
other architectural improvements to the code which manages page
wirings.
FreeBSD has historically maintained two separate reference counters in
the structure which describes a single physical page of memory. These
counters initially had quite different properties, but have over time
become more and more similar. Some work to merge the two counters has
landed in FreeBSD-CURRENT. This does not have any user-visible effects,
but it simplifies the page management code and removes a large amount
of code which existed solely to transform references of one type to the
other. Such code also made use of heavily contended locks, so the
simplification improved kernel scalability for some workloads and has
enabled further scalability improvements.
UMA is the slab allocator used in FreeBSD's kernel. It is the backend
which services virtually all dynamic memory allocations performed in
the kernel. The first round of NUMA improvements added NUMA awareness
to the "keg" layer of UMA, which allocates and manages slabs.
However,
the frontend of UMA, which provides several layers of caching for
objects, did not provide domain-aware caching, so over time the caches
would become "polluted" with objects from different memory domains.
However, this caching layer is being modified to ensure that objects
from different memory domains are partitioned, helping ensure that
consumers can perform domain-local allocations and frees efficiently.
This will enable a global "first-touch" allocation policy for
UMA-managed objects.
During boot, the FreeBSD kernel allocates a number of static data
structures to track physical memory. These structures have historically
lived in the lowest available range of physical memory, so they many
not inhabit the same NUMA domain as the memory that they track. This is
suboptimal when one tries to affinitize a workload to a particular NUMA
domain: if while executing the workload the kernel frequently accesses
page structures for local memory, and the page structures themselves
are not placed in local memory, the kernel will perform many remote
memory accesses. Some in-progress work for the amd64 platform creates
multiple arrays of page tracking structures, one per NUMA domain, and
ensures that each array is local to its domain. This complicates the
task of initializing kernel data structures during boot, but can
substantially reduce the amount of cross-domain communication that
occurs while the kernel is performing useful work. Similarly, some
patches to affinitize per-CPU structures are being developed; while
most per-CPU memory allocations already return CPU-local memory, some
structures allocated during boot are not yet properly placed with
respect to the accessing CPU's memory domain.
This project was sponsored by Netflix.
__________________________________________________________________
Architectures
Updating platform-specific features and bringing in support for new
hardware platforms.
Broadcom ARM64 SoC support
Contact: Michal Stanek <mst at semihalf.com>
Contact: Kornel Duleba <mindal at semihalf.com>
Contact: Marcin Wojtas <mw at semihalf.com>
The Semihalf team continued working on FreeBSD support for the Broadcom
BCM5871X SoC series
BCM5871X are quad-core 64-bit ARMv8 Cortex-A57 communication processors
targeted for networking applications such as 10G routers, gateways,
control plane processing and NAS.
Completed since the last update:
* iProc PCIe root complex (internal and external buses): fixes and
improvements, including adding a BCM58712 quirk to GICv2m driver
* BNXT Ethernet support: sys/dev/bnxt.c driver has been extended to
support the BCM58700 variant, and the iflib was made to work
without IO cache coherency
In progress:
* Crypto engine acceleration for IPsec offloading.
Todo:
* Upstreaming of work. This work is expected to be submitted/merged
to HEAD in the second half of 2019.
This project was sponsored by Juniper Networks, Inc.
__________________________________________________________________
NXP ARM64 SoC support
Contact: Marcin Wojtas <mw at semihalf.com>
Contact: Artur Rojek <ar at semihalf.com>
The Semihalf team initiated working on FreeBSD support for the NXP
LS1046A SoC
LS1046A are quad-core 64-bit ARMv8 Cortex-A72 processors with
integrated packet processing acceleration and high speed peripherals
including 10 Gb Ethernet, PCIe 3.0, SATA 3.0 and USB 3.0 for a wide
range of networking, storage, security and industrial applications.
Already completed:
* Platform base support (ramp-up multi-user SMP operation with UART)
* SATA 3.0
In progress:
* USB3.0
* SD/MMC
* I2C
Todo:
* Ethernet support
* GPIO
* QSPI
* Upstreaming of developed features. This work is expected to be
submitted/merged to HEAD in the Q4 of 2019.
This project was sponsored by Alstom Group.
__________________________________________________________________
Third-Party Projects
Many projects build upon FreeBSD or incorporate components of FreeBSD
into their project. As these projects may be of interest to the broader
FreeBSD community, we sometimes include brief updates submitted by
these projects in our quarterly report. The FreeBSD project makes no
representation as to the accuracy or veracity of any claims in these
submissions.
Aberdeen Hackathon
At BSDCam in Cambridge last year we had a discussion to create a
template Hackathon in the same way we have a template for Devsummits.
To test out the idea I was convinced (I swear tricked is the correct
word) to host a Hackathon in Aberdeen.
As a project I think we benefit a lot from hackathons, but they do take
a little organisation. The worst part of this is dealing with getting
money from attendees so you can pay for events. I spoke with Deb
Goodkin from the foundation at BSDCam and we arranged to use their new
EventBrite based system to handle ticketing.
Overall this system made it straight forward for attendees to register
and get me their details and requirements. After the event the expenses
were then recouped from the foundation. This was much easier than me
putting together a custom system or even setting up and using
EventBrite myself.
The hackathon went well, you can read in Benedict and Kristof's reports
that follow, but it was less well attended than I originally expected.
For hackers planning future hackathons remember to take heed of common
national holidays (we could have planned the event to not land at
Easter) and expect major geopolitical events to make things
unpredictable (we knew Brexit would do something, but not when).
I need to thank the University of Aberdeen for providing the location
for the Hackathon and to encourage you to run a hackathon where you
are. The next one should be in your home town.
Benedict Reuschling
The hackathon in Aberdeen was happening in the week of Easter at the
University of Aberdeen. Although only Kristof Provost (kp@) and myself
joined our host Tom Jones, I still consider it a productive week for
us. The overall theme of the hackathon was networking and each of us
provided something towards that goal (be it PRs, submitting unfinished
work, or other bits and pieces). We got together the night of Tuesday,
April 16 over dinner and talked about what our plans were for the week.
Kristof and I had talked at AsiaBSDcon when I took his tutorial about
Testing in FreeBSD that we should add a chapter about it in the
developers handbook. We also used our first meeting to synchronize each
other about the latest news in FreeBSD from our developers viewpoint.
The next day, we met up at the Frazer Noble building where the
hackathon was taking place. It was one of the newer buildings on
campus, nicely integrated into the older houses of the city. Since we
were only a handful, we sat in Tom's office for the hackathon, which
had plenty of room. He also showed us the room where we are supposed to
be having the hackathon if we were more people and Tom gave us a little
tour. Working in a university myself, I'm always interested in how
other education organizations are structured and the rooms and
equipment they provide for learning. Overall, my impression was that
there is a good amount of space and equipment available, which we could
have used in the hackathon.
After returning, we decided to use a special tag in the commits we
would be doing to identify them as coming from this hackathon. We chose
"Event:" for it as it is a general enough term to be used at other
events like conferences, too. The "Sponsored by:" line we used in
the
past is more for companies or individuals sponsoring certain features,
so I created a review to add this line to the committers guide.
Kristof had a couple of changes to the pf chapter in the FreeBSD
handbook for me, so I started going through those. I created a review
for him and the commit was made there and then, making use of the short
feedback cycle. Originally, we thought about bringing in people via
hangouts, but then resolved to contact people via our usual IRC channel
if we needed their input.
Kristof and Tom worked on some network specific stuff, whereas I
started work on creating an initial draft for the testing chapter. We
would occasionally start talking about something and then return to our
work in silence. If we needed to coordinate or had questions, we simply
asked and could continue once we got our answer. This provided a nice
atmosphere to work in. I tackled some doc PRs while Kristof found a bug
in pf and fixed it.
The afternoons were spent at different locations within walking
distance. Tom made sure we got a good impression on how it is to be a
student and that there is both taste and variety of food available. In
the evenings, Tom drove us into town to have dinner at various
restaurants over the week.
Aberdeen has a lot to offer as a city. Starting from the second day,
Kristof and I would meet up at my hotel, which was close to the
Aberdeen beach and walk along it to the University. According to Tom,
it is possible to see Dolphins when the weather is right and the gulf
stream provides the city with enough warmth that the winters aren't as
bad as you'd think this far up north.
Tom also gave us a tour of the zoological department of the university,
which offered a beautiful garden with various plants and trees, as well
as a museum with zoological specimen. This offered a great spot for
photographs and to unwind a bit from the technical discussions we've
had. Tom also had t-shirts made for the event, which are already rare
collectors items.
I had to return on Sunday, so Tom took us on a tour of the Scottish
highlands in his car the day before. We stopped at a couple of places
to take pictures and Tom would explain at lot to us having lived there
all his life. We came to Stonehaven and had fish and chips there from a
take-out restaurant that had a lot of awards for sustainable fishing.
This was certainly a highlight for the week and even then, we couldn't
stop talking about FreeBSD and networking.
Although more people would maybe have produced more output, the three
of us were certainly productive as a small group. It also made planning
and coordination easier and more flexible. Tom Jones had done a lot of
preparation and was an excellent guide. I would encourage him to host
another such hackathon in the future and hope that next time, more
people will take a trip to Aberdeen to spend some time hacking on
FreeBSD
Kristof Provost
While I'd been to Scotland before I'd never seen Aberdeen. It's a
charming city, and I enthusiastically recommend visiting.
I arrived a little while after Benedict, but made it to my hotel
easily, and turned up in time to join Benedict and Tom for dinner.
Despite being small (or perhaps because of it), the hackathon was
remarkably productive. Benedict and I went through the pf documentation
in the handbook, so that Benedict could rework and improve it.
(Benedict's doing the work, but I'm going to take credit anyway.)
Tom and I looked at the GSoC proposals and tried to find potential
mentors for two promising proposals. Both of us are candidate mentors
as well. We should know soon if our students are awarded slots.
Tom also proposed a patch to eliminate RFC 2675 IPv6 Jumbograms. It has
my enthusiastic support.
I managed to look at a couple of open pf issues:
* pfctl's interface_group() function checks if a name is an interface
or an interface group. It still thought that interface names always
ended with a number, but this assumption has been wrong for several
years now. That's fixed in r346370.
* The DIOCRSETTFLAGS ioctl() misused copyin() (It held a lock calling
it), which could result in panics.
* That previous issue was actually discovered by my local instance of
syzcaller, which I'd set up to add pf support to it. That support
has now been merged, so we may see more issues detected by
syzcaller soon.
* Also for the DIOCRSETTFLAGS problem I extended the pf tests to
check for this issue.
* The pf tests will now fail if the pft_set_rules call fails to set
the rules. That didn't actually cause issues yet, but it'll make
debugging tests slightly easier, and they may catch more problems
now.
On Saturday Tom took us out to discover some of the pretty bits of
Scotland. It turns out there are a lot of them. I can't really do it
justice, but Tom has a promising career at the Scottish tourism board
when this computers fad blows over.
On my way home I passed through Oslo, and took the opportunity to meet
with (have lunch with) two of the EuroBSDCon local organisers.
EuroBSDCon is filling up fast, make sure to register now to secure your
place!
__________________________________________________________________
Bring more Security Intelligence to FreeBSD
Links
Maltrail - distributed Malware detection
URL: https://github.com/stamparm/maltrail
Wazuh - thread detection and incident response
URL: https://wazuh.com/
Contact: Michael Muenz <m.muenz at gmail.com>
To bring more Security Intelligence we maintain the FreeBSD port of
zmaltail. This open source project based on Python can act as a sensor
and/or as a central server. It listens in defined ports or protocols
and compares IP addresses and domains against static and dynamic feeds,
contributed by the community.
As you can install this piece of software on multiple firewalls and let
them send to a central server, you are able to detect attacks and
compromises very fast. Within Q2 we updated the port to the latest
version and are constantly in contact with the core developer (also
co-author of SQLmap) to bring out new features.
The second project we are currently trying to add as a port is Wazuh.
Wazuh is a fork of Ossec which is already in the ports tree. Compared
to Ossec, Wazuh has some intelligent addition like full ELK-Stack
integration with own apps and dashboards.
With Wazuh installed on your webserver, or even on your windows desktop
you can monitor file integrity or log files for most kind of attacks.
Active response features let you e.g. send API calls to your firewalls
to dynamically block this offender.
As Wazuh offers a complete ELK-Stack you can use it also as a central
logging solution for better security insights into your network.
This project was sponsored by m.a.x. Informationstechnologie AG.
__________________________________________________________________
libvdsk - QCOW2 implementation
Links
Github - libvdsk repo
URL: https://github.com/xcllnt/libvdsk
Contact: Sergiu Weisz <sergiu121 at gmail.com>
Contact: Marcel Molenaar <marcel at freebsd.org>
Contact: Marcelo Araujo <araujo at freebsd.org>
Contact: Mihai Carabas <mihai at freebsd.org>
Add support for using QCOW in bhyve using the libvdsk library. Libvdsk
was used to substitute the regular disk operations from bhyve with a
call to libvdsk which will in turn call the disk-specific handler for
the operation.
To use this feature one has to install the libvdsk-enabled bhyve
version along with libvdsk from the libvdsk repo linked above.
New features added:
* Extend libvdsk to make it easier to implement new formats
* Improve read/write performance and stability
* Add support for Copy-On-Write
Future tasks:
* Integrate libvdsk in bhyve
Matthew Grooms
__________________________________________________________________
nsysctl 1.0
Links
gitlab.com/alfix/nsysctl
URL: https://gitlab.com/alfix/nsysctl
sysutils/nsysctl port
URL: https://www.freshports.org/sysutils/nsysctl/
Tutorial
URL: https://alfix.gitlab.io/bsd/2019/02/19/nsysctl-tutorial.html
Contact: Alfonso Sabato Siciliano <alfonso.siciliano at email.com>
The nsysctl utility is a /sbin/sysctl clone, to get or set the kernel
state, supporting libxo and extra options.
nsysctl [--libxo=opts [-r tagname]]
[-DdFGgIilmNpqTt[V|v[h[b|o|x]]]Wy]
[-e sep] [-B <bufsize>] [-f filename]
name[=value[,value]] ...
nsysctl [--libxo=opts [-r tagname]]
[-DdFGgIlmNpqTt[V|v[h[b|o|x]]]Wy]
[-e sep] [-B <bufsize>] -A|a|X
You could use nsysctl to explore the sysctl MIB showing the value and
the info of an object. The output is explicitly indicated by the
options and is printed via libxo in human and machine readable formats,
moreover some value is parsed to display it in a structured mode (e.g.,
vm.phys_free). The support for efi_map_header was added but it is
untested, someone could help by trying it via machdep.efi_map.
Please refer to the tutorial for a more thorough description.
__________________________________________________________________
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