From: Dave Chinner <david@fromorbit.com>
To: Benjamin Schindler <bschindler@inf.ethz.ch>
Cc: xfs@oss.sgi.com
Subject: Re: xfs performance problem
Date: Wed, 27 Apr 2011 12:35:34 +1000 [thread overview]
Message-ID: <20110427023534.GF12436@dastard> (raw)
In-Reply-To: <4DB72084.8020205@inf.ethz.ch>
On Tue, Apr 26, 2011 at 09:44:04PM +0200, Benjamin Schindler wrote:
> Hi
>
> Since upgrading to newer kernels I have serious problems with xfs
> performance on my root fs.
> It runs on a software raid 0 with 2 disks. On the same two disks, there
> are two more partitions running a software raid-1 with ext3. On the ext3
> system, I have no issue, so I assume the drives are fine.
> But on the xfs filesystem, extracting a linux kernel archive takes 5
> minutes or more, running ldconfig similarily long. The harddrives are
> sata-2.
> I'm running gentoo linux with kernel 2.6.38-gentoo-r1. I'm attaching the
> kernel config but I guess more info is needed - just let me know what is
> needed.
more than likely your problem is that barriers have been enabled for
MD/DM devices on the new kernel, and they aren't on the old kernel.
XFS uses barriers by default, ext3 does not. Hence XFS performance
will change while ext3 will not. Check dmesg output when mounting
the filesystems on the different kernels.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2011-04-27 2:32 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-26 19:44 xfs performance problem Benjamin Schindler
2011-04-26 22:12 ` Stan Hoeppner
2011-04-26 23:23 ` Benjamin Schindler
2011-04-26 23:59 ` Benjamin Schindler
2011-04-29 15:00 ` Peter Grandi
2011-04-30 20:36 ` Michael Monnerie
2011-05-01 8:49 ` Dave Chinner
2011-05-01 14:38 ` Peter Grandi
2011-05-01 15:08 ` Peter Grandi
2011-05-01 15:32 ` Michael Monnerie
2011-05-01 17:04 ` Peter Grandi
2011-05-02 2:50 ` Dave Chinner
2011-05-02 20:10 ` Emmanuel Florac
2011-05-01 13:33 ` Peter Grandi
2011-05-01 16:32 ` Peter Grandi
2011-04-27 7:55 ` Michael Weissenbacher
2011-04-27 8:09 ` Benjamin Schindler
2011-04-27 2:35 ` Dave Chinner [this message]
2011-04-29 16:27 ` Martin Steigerwald
2011-05-01 8:52 ` Dave Chinner
2011-05-01 16:55 ` Christoph Hellwig
2011-05-01 18:24 ` Markus Trippelsdorf
2011-05-02 10:14 ` Christoph Hellwig
-- strict thread matches above, loose matches on Subject: below --
2011-04-29 16:28 Martin Steigerwald
2011-04-29 19:51 ` Peter Grandi
2011-05-01 16:56 ` Benjamin Schindler
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