From: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
To: linux-xfs@oss.sgi.com
Cc: Matthew Whittaker-Williams <matthew@xsnews.nl>
Subject: Re: XFS hangs and freezes with LSI 9265-8i controller on high i/o
Date: Fri, 15 Jun 2012 13:25:26 +0200 [thread overview]
Message-ID: <4FDB1BA6.3030203@itwm.fraunhofer.de> (raw)
In-Reply-To: <20120615001602.GF7339@dastard>
On 06/15/2012 02:16 AM, Dave Chinner wrote:
> Oh, I just noticed you are might be using CFQ (it's the default in
> dmesg). Don't - CFQ is highly unsuited for hardware RAID - it's
> hueristically tuned to work well on sngle SATA drives. Use deadline,
> or preferably for hardware RAID, noop.
I'm not sure if noop is really a good recommendation even with hw raid,
especially if the the request queue size is high. This week I did some
benchmarks with a high rq write size (triggered with
sync_file_range(..., SYNC_FILE_RANGE_WRITE) ) and with noop concuring
reads then almost entirely got stalled.
With deadline read/write balance was much better, although writes still
had been preferred (with sync_file_range() and without). I always
thought deadline prefers reads and I hope I find some time later on to
investigate further what was going on.
Test had been on a netapp E5400 hw raid, so rather high end hw raid.
Cheers,
Bernd
_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
next prev parent reply other threads:[~2012-06-15 11:25 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-11 21:37 XFS hangs and freezes with LSI 9265-8i controller on high i/o Matthew Whittaker-Williams
2012-06-12 1:18 ` Dave Chinner
2012-06-12 15:56 ` Matthew Whittaker-Williams
2012-06-12 17:40 ` Matthew Whittaker-Williams
2012-06-13 0:12 ` Stan Hoeppner
2012-06-13 1:19 ` Dave Chinner
2012-06-13 3:56 ` Stan Hoeppner
2012-06-13 8:54 ` Matthew Whittaker-Williams
2012-06-13 11:59 ` Andre Noll
2012-06-13 12:13 ` Michael Monnerie
2012-06-13 16:12 ` Stan Hoeppner
2012-06-14 7:31 ` Michael Monnerie
2012-06-14 0:04 ` Dave Chinner
2012-06-14 14:31 ` Matthew Whittaker-Williams
2012-06-15 0:16 ` Dave Chinner
2012-06-15 9:52 ` Michael Monnerie
2012-06-15 12:29 ` Dave Chinner
2012-06-15 11:25 ` Bernd Schubert [this message]
2012-06-15 12:30 ` Dave Chinner
2012-06-15 14:22 ` Bernd Schubert
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=4FDB1BA6.3030203@itwm.fraunhofer.de \
--to=bernd.schubert@itwm.fraunhofer.de \
--cc=linux-xfs@oss.sgi.com \
--cc=matthew@xsnews.nl \
/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