From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 14830] When other IO is running sync times go to 10 to 20
minutes
Date: Thu, 20 May 2010 02:11:55 GMT
Message-ID: <201005200211.o4K2BtG0030354@demeter.kernel.org>
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Justin Maggard changed:
What |Removed |Added
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CC| |jmaggard10@gmail.com
--- Comment #39 from Justin Maggard 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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