From: Dave Chinner <david@fromorbit.com>
To: CAI Qian <caiqian@redhat.com>
Cc: Steve Best <sbest@redhat.com>, xfs@oss.sgi.com
Subject: Re: possible fsync02() xfs slowness regression on power7
Date: Thu, 28 Feb 2013 22:54:10 +1100 [thread overview]
Message-ID: <20130228115410.GN5551@dastard> (raw)
In-Reply-To: <2103242337.7001373.1362043715738.JavaMail.root@redhat.com>
On Thu, Feb 28, 2013 at 04:28:35AM -0500, CAI Qian wrote:
> This LTP test starting to fail using the latest upstream kernel on one of the power7
> systems here, http://tinyurl.com/bngwouj
>
> # ./fsync02
> fsync02 1 TFAIL : fsync took too long: 252.000000 seconds; max_block: 214
>
> When it is working, the test is almost returned immediately. The bisecting so far
> indicated that one or a few of the following could be culprits.
>
> # git log --pretty=oneline 498f7f505dc79934c878c7667840c50c64f232fc..b199c8a4ba11879df87daad496ceee41fdc6aa82
They are all patches committed more than 2 years ago, and none of
them are platform specific. This sounds more like a machine specific
issue than a platform specific problem (i.e. lots of RAM, slow,
slow disk).
In future when reporting a bug, please tell use hardware you are
using as per:
http://xfs.org/index.php/XFS_FAQ#Q:_What_information_should_I_include_when_reporting_a_problem.3F
Given that this is a sparse file test that repeatedly extends the
file, this is the likely culprit:
> 055388a3188f56676c21e92962fc366ac8b5cb72 xfs: dynamic speculative EOF preallocation
And this commit in 3.9-rc1:
a1e16c2 xfs: limit speculative prealloc size on sparse files
should fix the problem. Please confirm these commits are the cause
and the fix respectively....
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2013-02-28 11:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <130819766.6999797.1362043338279.JavaMail.root@redhat.com>
2013-02-28 9:28 ` possible fsync02() xfs slowness regression on power7 CAI Qian
2013-02-28 11:54 ` Dave Chinner [this message]
2013-03-01 9:20 ` CAI Qian
2013-03-04 4:23 ` CAI Qian
2013-03-04 5:55 ` Dave Chinner
2013-03-04 6:14 ` CAI Qian
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