From: Phil Dier <phil@icglink.com>
To: linux-kernel@vger.kernel.org
Cc: ziggy <ziggy@icglink.com>, Jack Massari <jack@icglink.com>,
Scott Holdren <scott@icglink.com>
Subject: Slow I/O with SMP, Fusion-MPT and u160 SCSI JBOD
Date: Wed, 14 Sep 2005 15:01:09 -0500 [thread overview]
Message-ID: <20050914150109.232c6765.phil@icglink.com> (raw)
Hi,
I just tried the 2.6.14-rc1 kernel to see if it exhibits the behaviour
I have described before[0]. It still does. Briefly, I have a dual Xeon
2.8 with 4GB ram, 1 adaptec and 1 fusion-mpt scsi device, each connected
to 1 SCSI JBOD with 5 disks apiece[1]. I/O on scsi ids 0 and 1 both
work flawlessly. I built an md device across ids 2 and 3, and the disks
connected to the fusion-mpt are unbearably slow. This behaviour was not
present in 2.6.12.3. When I partition the devices in question and mount
a filesystem on them, they exhibit the same behaviour individually.
[0]: http://www.ussg.iu.edu/hypermail/linux/kernel/0508.3/1233.html
[1]: http://www.icglink.com/debug-2.6.14-rc1.html
Here is what iostat looks like during what should be heavy I/O (my
tesh.sh script described in [1] is running), showing only the relevant
devices:
$ iostat 1 -k | awk '/(Device|md5|md6|md7)/{print $0;}'
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.62 0.00 2.46 244 198312
md6 0.62 0.00 2.46 228 198312
md7 0.61 0.01 2.45 440 197856
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 25.74 0.00 102.97 0 104
md6 25.74 0.00 102.97 0 104
md7 9.90 0.00 39.60 0 40
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 59.41 0.00 237.62 0 240
md6 60.40 3.96 237.62 4 240
md7 20.79 3.96 79.21 4 80
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 100.99 0.00 403.96 0 408
md6 100.99 0.00 403.96 0 408
md7 72.28 0.00 289.11 0 292
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 16242.57 0.00 64970.30 0 65620
md6 16242.57 0.00 64970.30 0 65620
md7 16230.69 0.00 64922.77 0 65572
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 1014.85 0.00 4059.41 0 4100
md6 1014.85 0.00 4059.41 0 4100
md7 1014.85 0.00 4059.41 0 4100
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 3298.02 0.00 13192.08 0 13324
md6 3298.02 0.00 13192.08 0 13324
md7 3298.02 0.00 13192.08 0 13324
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 2789.11 0.00 11156.44 0 11268
md6 2789.11 0.00 11156.44 0 11268
md7 2789.11 0.00 11156.44 0 11268
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
md5 0.00 0.00 0.00 0 0
md6 0.00 0.00 0.00 0 0
md7 0.00 0.00 0.00 0 0
Thanks for looking. Please cc me on replies.
--
Phil Dier (ICGLink.com -- 615 370-1530 x733)
/* vim:set noai nocindent ts=8 sw=8: */
next reply other threads:[~2005-09-14 20:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-14 20:01 Phil Dier [this message]
2005-09-14 20:55 ` Slow I/O with SMP, Fusion-MPT and u160 SCSI JBOD John Stoffel
2005-09-14 21:41 ` Mark Lord
2005-09-14 21:58 ` Phil Dier
2005-09-14 22:08 ` Phil Dier
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=20050914150109.232c6765.phil@icglink.com \
--to=phil@icglink.com \
--cc=jack@icglink.com \
--cc=linux-kernel@vger.kernel.org \
--cc=scott@icglink.com \
--cc=ziggy@icglink.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