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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)


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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?


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             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

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