linux-ext4 - [Bug 14830] When other IO is running sync times go to 10 to 20 minutes

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Message-Id: <201005200211.o4K2BtG0030354@demeter.kernel.org>
Date:	Thu, 20 May 2010 02:11:55 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 14830] When other IO is running sync times go to 10 to 20
 minutes

https://bugzilla.kernel.org/show_bug.cgi?id=14830


Justin Maggard <jmaggard10@...il.com> changed:

           What    |Removed                     |Added
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                 CC|                            |jmaggard10@...il.com




--- Comment #39 from Justin Maggard <jmaggard10@...il.com>  2010-05-20 02:11:11 ---
(In reply to comment #28)
> Created an attachment (id=25883)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=25883) [details]
> Patch to stop background writeback when other work is queued for the thread
> 
> Oops, attached a wrong patch. This is the right one.

I ran into this issue recently (extra long sync times) and have been trying the
patches attached in this thread.  The above patch specifically causes a pretty
significant performance regression for me doing a simple sequential dd write on
a dual-core Atom system running 2.6.33.4 x86_64.  This command:
dd bs=1M conv=fsync if=/dev/zero of=test_file count=10000
went from 135 MB/sec to all the way down to 92.9 MB/sec.  Is this expected?

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