search for: blksizes

Although the time spent in memcpy/memset probably pales in comparison to time spent in socket I/O, it's still worth worth reducing the number of times we have to utilize a bounce buffer when we already have aligned data. Note that blocksize, cache, and cow all do block fragmentation and bounce-buffer alignment; this brings the logic in cache and cow (which were copied from one another) more

Based on Rich's review of my v1 that touched only cache.c, I have now tried to bring all three filters with alignment rounding in line with one another. There is definitely room for future improvements once we teach nbdkit to let filters and plugins advertise block sizes, but I'm hoping to get NBD_CMD_CACHE implemented first. Eric Blake (2): blocksize: Process requests in linear order

Good Afternoon, As per the installation guide, section 30.2.2 I?ve created an efidefault file at /var/lib/tftpboot/pxelinux/pxelinux.cfg/efidefault However, this file is never requested by the 64 bit PXE loader (bootx64.efi), as shown by tcpdump: 75 RRQ "/pxelinux/42272635-0011-5053-ACF2-82A100E615F2" octet tsize 0 blksize 512 59 RRQ "/pxelinux/01-00-50-56-A7-BA-BF"

Here's the patch (on top of the preceeding one) which uses a bitmap instead of SEEK_DATA. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org --4VrXvz3cwkc87Wze

The original plan was to have a background thread doing the reclaim. However that cannot work given the design of filters, because a background thread cannot access the next_ops struct which is only available during requests. Therefore we spread the work over the request threads. Each blk_* function checks whether there is work to do, and if there is will reclaim up to two blocks from the cache

I'm seeing the following error in our logs when removing mailboxes (we are using mdbox and dovecot 2.1.8): Aug 1 20:03:36 msgsrv dovecot: imap(test at test.com): Error: stat(/mailstore/domains/test.com/test/mdbox/mailboxes/Spam) failed: Operation not permitted Aug 1 20:03:36 msgsrv dovecot: imap(test at test.com): Mailbox deleted: Spam When I run truss against the process it appears the

Although the time spent in memcpy/memset probably pales in comparison to time spent in socket I/O, it's still worth worth reducing the number of times we have to utilize a bounce buffer when we already have aligned data. Signed-off-by: Eric Blake <eblake@redhat.com> --- filters/cache/cache.c | 60 ++++++++++++++++++++++++++++--------------- 1 file changed, 39 insertions(+), 21

v4: https://www.redhat.com/archives/libguestfs/2019-January/msg00032.html v5: - Now we set the block size at run time. I'd like to say that I was able to test this change, but unfortunately I couldn't find any easy way to create a filesystem on x86-64 with a block size > 4K. Ext4 doesn't support it at all, and XFS doesn't support block size > page size (and I

Eric, you'll probably find the design "interesting" ... It does work, for me at least. Rich.

Right now, the cache and cow filters always round up requests to blksize boundaries (blksize for cache is dynamically determined at connection start, for cow is fixed as BLKSIZE). Which is fine for the bulk of the underlying file, but can cause problems when reading past EOF for a partial tail of an underlying plugin. We aren't validating that filter calls to next_ops are within bounds; and

Hello, I am attempting to setup a PXE setup for a network using multiple subnets. The current layout has dhcp on one subnet (10.16.215.8/30), tftp on another (10.16.194.0/23), and the system to be installed on yet another subnet ( 10.16.233.0/24 [there's actually about 30 different subnets the system to be installed could be on]). When I have the system to be installed on the same subnet as

Linux kernel only supports logical block sizes which are power of two, at least 512 bytes and no more that PAGE_SIZE. Check this instead of crashing later on. Note that there is no need to check physical block size since it is only a hint, and virtio-blk already only supports power of two values. Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=1664619 Signed-off-by: Maxim Levitsky

Linux kernel only supports logical block sizes which are power of two, at least 512 bytes and no more that PAGE_SIZE. Check this instead of crashing later on. Note that there is no need to check physical block size since it is only a hint, and virtio-blk already only supports power of two values. Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=1664619 Signed-off-by: Maxim Levitsky

Hi, I am using a Windows Server 2012 R2 Hyper-V Generation 2 VM as a PXE client (no physical machines available). This is a UEFI VM, and as per instructions I've read I have disabled secure boot on this VM for the installation of Linux. I am using the latest tftp-hpa package with the following config: # /etc/default/tftpd-hpa TFTP_USERNAME="tftp"

Been looking high and low for an option to request blksize in the hpa tftp client but I cant find one. How do I request a bigger blksize with the hpa tftp client? Jocke

This is exactly the same as v1: https://www.redhat.com/archives/libguestfs/2018-December/msg00004.html except that it now frees the bitmap on unload (which the old code did not - there was always a memory leak). Rich.

On 12/2/18 10:33 AM, Richard W.M. Jones wrote: > The cow and cache filters both use a bitmap mapping virtual disk > blocks to status stored in the bitmap. The implementation of the > bitmaps is very similar because one was derived from the other when > the filters were implemented. > > The main difference is the cow filter uses a simple bitmap (one bit > per block), whereas

Hey, I have a problem booting certain machines with pxelinux. I have pxelinux.0 in the root of my tftp server and dhcp pointing to the right location: # dhcpd.conf authoritative; option domain-name "example.net"; ddns-update-style none; default-lease-time 3600; max-lease-time 86400; subnet 10.0.0.0 netmask 255.255.255.0 { range 10.0.0.3 10.0.0.20; server-name

Gene and co, Now my pxelinux efi 64 boot is properly loading syslinux.efi (via TFTP) It then issues a TFTP file request for efi.x64/pxelinux.cfg/ldlinux.e64. (All my efi x64 content is under efi.x64/pxelinux.cfg). However, I see that it fails to properly negotiate the TFTP options with my TFTP server. so it never transfers ldlinux.e64 over. In its file request packet, it asks for these TFTP

On Wed, 2020-07-15 at 06:06 -0400, Michael S. Tsirkin wrote: > On Wed, Jul 15, 2020 at 12:55:18PM +0300, Maxim Levitsky wrote: > > Linux kernel only supports logical block sizes which are power of > > two, > > at least 512 bytes and no more that PAGE_SIZE. > > > > Check this instead of crashing later on. > > > > Note that there is no need to check