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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



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  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

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