From: Thomas Lynema <lyz27@yahoo.com>
To: xfs@oss.sgi.com
Subject: Poor performance using discard
Date: Tue, 28 Feb 2012 17:56:18 -0500 [thread overview]
Message-ID: <1330469778.9688.7.camel@core24> (raw)
[-- Attachment #1.1: Type: text/plain, Size: 1270 bytes --]
Please reply to my personal email as well as I am not subscribed to the
list.
I have a PP120GS25SSDR it does support trim
cat /sys/block/sdc/queue/discard_max_bytes
2147450880
The entire drive is one partition that is totally used by LVM.
I made a test vg and formatted it with mkfs.xfs. Then mounted it with
discard and got the following result when deleting a kernel source:
/dev/mapper/ssdvg0-testLV on /media/temp type xfs
(rw,noatime,nodiratime,discard)
time rm -rf linux-3.2.6-gentoo/
real 5m7.139s
user 0m0.080s
sys 0m1.580s
There where lockups where the system would pause for about a minute
during the process.
ext4 handles this scenerio fine:
/dev/mapper/ssdvg0-testLV on /media/temp type ext4
(rw,noatime,nodiratime,discard)
time rm -rf linux-3.2.6-gentoo/
real 0m0.943s
user 0m0.050s
sys 0m0.830s
xfs mounted without discard seems to handle this fine:
/dev/mapper/ssdvg0-testLV on /media/temp type xfs
(rw,noatime,nodiratime)
time rm -rf linux-3.2.6-gentoo/
real 0m1.634s
user 0m0.040s
sys 0m1.420s
uname -a
Linux core24 3.2.5-gentoo #11 SMP PREEMPT Sat Feb 11 15:46:22 EST 2012
x86_64 Intel(R) Core(TM)2 Quad CPU Q6700 @ 2.66GHz GenuineIntel
GNU/Linux
Any suggestions?
[-- Attachment #1.2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 198 bytes --]
[-- Attachment #2: Type: text/plain, Size: 121 bytes --]
_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
next reply other threads:[~2012-02-28 22:56 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-28 22:56 Thomas Lynema [this message]
2012-02-28 23:58 ` Poor performance using discard Peter Grandi
2012-02-29 1:22 ` Dave Chinner
2012-02-29 2:00 ` Thomas Lynema
2012-02-29 4:08 ` Dave Chinner
2012-02-29 10:38 ` Peter Grandi
2012-02-29 19:46 ` Eric Sandeen
2012-03-01 5:59 ` Christoph Hellwig
2012-03-01 6:27 ` Dave Chinner
2012-03-01 6:31 ` Christoph Hellwig
[not found] ` <1330658311.6438.24.camel@core24>
2012-03-02 14:57 ` Thomas Lynema
2012-03-02 15:41 ` Thomas Lynema
2012-03-05 3:02 ` Dave Chinner
2012-03-05 6:41 ` Jeffrey Hundstad
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1330469778.9688.7.camel@core24 \
--to=lyz27@yahoo.com \
--cc=xfs@oss.sgi.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox