Displaying 20 results from an estimated 3000 matches similar to: "[PATCH v2 0/5] add new ioctls to do metadata readahead in btrfs"
2010 Nov 23
1
[RFC PATCH] fadvise support in rsync
Warning for kernel folks: I'm not much of an mm person; let me know if I got
anything horribly wrong.
Many folks use rsync in their nightly backup jobs. In these applications, speed
is of minimal concern and should be sacrificed in order to minimize the effect
of rsync on the rest of the machine. When rsync is working on a large directory
it can quickly fill the page cache with written data,
2011 Jun 10
6
[PATCH v2 0/6] btrfs: generic readeahead interface
This series introduces a generic readahead interface for btrfs trees.
The intention is to use it to speed up scrub in a first run, but balance
is another hot candidate. In general, every tree walk could be accompanied
by a readahead. Deletion of large files comes to mind, where the fetching
of the csums takes most of the time.
Also the initial build-ups of free-space-caches and
2010 Dec 20
7
DO NOT REPLY [Bug 7876] New: please implement o_direct
https://bugzilla.samba.org/show_bug.cgi?id=7876
Summary: please implement o_direct
Product: rsync
Version: 3.1.0
Platform: Other
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P3
Component: core
AssignedTo: wayned at samba.org
ReportedBy: costinel at gmail.com
QAContact:
2012 Oct 16
3
[PATCH] Change the check for PageReadahead into an else-if
From: Raghavendra D Prabhu <rprabhu@wnohang.net>
From 51daa88ebd8e0d437289f589af29d4b39379ea76, page_sync_readahead coalesces
async readahead into its readahead window, so another checking for that again is
not required.
Signed-off-by: Raghavendra D Prabhu <rprabhu@wnohang.net>
---
fs/btrfs/relocation.c | 10 ++++------
mm/filemap.c | 3 +--
2 files changed, 5
2011 Jun 29
14
[PATCH v4 0/6] btrfs: generic readeahead interface
This series introduces a generic readahead interface for btrfs trees.
The intention is to use it to speed up scrub in a first run, but balance
is another hot candidate. In general, every tree walk could be accompanied
by a readahead. Deletion of large files comes to mind, where the fetching
of the csums takes most of the time.
Also the initial build-ups of free-space-caches and
2007 May 07
1
Announce: rsync fadvise (cache dropping) patch updated
Hi List,
I have updated my rsync fadvise patch which stops rsync from
ousting all your other data from cache when running large jobs.
I have also written an article about the whole issue.
http://insights.oetiker.ch/linux/fadvise.html
cheers
tobi
--
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
http://it.oetiker.ch tobi@oetiker.ch ++41 62 213 9902
2009 Aug 10
5
Scalability plans: Abstract out filesystem and make it someone else's problem
This is something I figured out a few months ago, mainly because this
one guy at work (hi, Stu) kept telling me my multi-master replication
plan sucked and we should use some existing scalable database. (I guess
it didn't go exactly like that, but that's the result anyway.)
So, my current plan is based on a couple of observations:
* Index files are really more like memory dumps.
2010 Jul 28
6
Read ahead / prefetching
Hi,
I am trying to educate myself on prefetching/readahead algorithm for
Lustre''s read. For a starter I only have two simple questions.
1 - Does Lustre detect linear or random I/O pattern or it always triggers
readahead?
2 - If readahead is triggered, how many pages are read in addition to what
is necessary?
Thanks,
Arifa.
2019 Apr 01
1
[PATCH nbdkit v2] Add readahead filter.
Simpler, and including tests.
Rich.
2019 Apr 01
1
[PATCH nbdkit] Add readahead filter.
A suggested readahead filter. I've only lightly tested this, but it
seems to work fine with qemu-img convert. The commit needs proper
tests.
Rich.
2006 Jul 10
3
Kernel-utils stupidities (readahead and cpuspeed)
Hi all,
I think I've spotted a few stupidities (bugs) in the current version of
kernel-utils (kernel-utils-2.4-13.1.80). I'm sure these are all propagated
from upstream, but I hope someone could have a quick look to verify this and
see if we either can push complaints upwards, or provide local fixes.
The kernel-utils package provides several 'kernel-type' functions -
2020 Aug 07
3
Re: [PATCH nbdkit] file: Implement cache=none and fadvise=normal|random|sequential.
On Fri, Aug 07, 2020 at 07:53:13AM -0500, Eric Blake wrote:
> >$ free -m; time ./nbdkit file /var/tmp/random fadvise=sequential cache=none --run 'qemu-img convert -n -p -m 16 -W $nbd "json:{\"file.driver\":\"null-co\",\"file.size\":\"1E\"}"' ; free -m ; cachestats /var/tmp/random
>
> Hmm - the -W actually says that qemu-img is
2009 Jul 07
1
Sysctl on Kernel 2.6.18-128.1.16.el5
Sysctl Values
-------------------------------------------
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.tcp_window_scaling = 1
# vm.max-readahead = ?
# vm.min-readahead = ?
# HW Controler Off
# max-readahead = 1024
# min-readahead = 256
# Memory over-commit
# vm.overcommit_memory=2
# Memory to
2020 Jun 19
1
Re: [PATCH nbdkit] v2v: Disable readahead for VMware curl sources too (RHBZ#1848862).
On 6/19/20 7:47 AM, Richard W.M. Jones wrote:
> This appears to be the cause of timeouts during the conversion step
> where VMware VCenter server's Tomcat HTTPS server stops responding to
> requests (or rather, responds only with 503 errors). The server later
> recovers and in fact because of the retry filter the conversion
> usually succeeds, but I found that we can avoid the
2020 May 28
2
[PATCH v2v] v2v: -it vddk: Don't use nbdkit readahead filter with VDDK (RHBZ#1832805).
This is the simplest solution to this problem. There are two other
possible fixes I considered:
Increase the documented limit (see
http://libguestfs.org/virt-v2v-input-vmware.1.html#vddk:-esxi-nfc-service-memory-limits).
However at the moment we know the current limit works through
extensive testing (without readahead), plus I have no idea nor any way
to test if larger limits are supported by
2020 Jun 19
2
[PATCH nbdkit] v2v: Disable readahead for VMware curl sources too (RHBZ#1848862).
I'm still testing this fix, so let's hold off the review for the
moment.
Also it may be better to specifically identify problematic servers
rather than disabling this for every curl source. eg. I suspect that
the problem is the Java server used by VCenter, so we might think
about only disabling readahead for that single case.
Rich.
2010 Mar 02
2
crash when using the cp command to copy files off a striped gluster dir but not when using rsync
Hi,
I've got this strange problem where a striped endpoint will crash when
I try to use cp to copy files off of it but not when I use rsync to
copy files off:
[user at gluster5 user]$ cp -r Python-2.6.4/ ~/tmp/
cp: reading `Python-2.6.4/Lib/lib2to3/tests/data/fixers/myfixes/__init__.py':
Software caused connection abort
cp: closing
2016 Jan 25
3
Why is my rsync transfer slow?
dbonde+forum+rsync.lists.samba.org at gmail.com wrote:
> It is exactly as I wrote. On a network volume (A) a "sparse disk image bundle" (B), i.e., a type of disk image used in OS X, is stored. B is then mounted locally (i.e., local to where rsync is run) on a computer (C) where it appears as one of many volumes.
>
> In other words, B is stored on A. A is then mounted (using
2008 Apr 08
4
ZFS deadlock
Hello
A box of mine running RELENG_7_0 and ZFS over a couple of disks (6
disks, 3 mirrors) seems to have gotten stuck. From Ctrl-T:
load: 0.50 cmd: zsh 40188 [zfs:&buf_hash_table.ht_locks[i].ht_lock]
0.02u 0.04s 0% 3404k
load: 0.43 cmd: zsh 40188 [zfs:&buf_hash_table.ht_locks[i].ht_lock]
0.02u 0.04s 0% 3404k
load: 0.10 cmd: zsh 40188 [zfs:&buf_hash_table.ht_locks[i].ht_lock]
2012 Oct 12
2
scp scripting question
So, my manager, in zsh, can do the following:
scp -i =(ssh -qnx <snip> cat /etc/ks/ks_dsa) localfile server:/whereitgoes
Does anyone have any ideas what the syntax in bash is? I've been playing
with this for hours. My manager says that zsh treats the cat'd key as a
file, while if you try it with bash, replacing the = with <, it asks for
the passphrase of what must be a socket.