linux-ext4 - [Bug 20902] High IO wait when writing to ext4

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Message-Id: <201010291623.o9TGNfZ7018396@demeter1.kernel.org>
Date:	Fri, 29 Oct 2010 16:23:41 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 20902] High IO wait when writing to ext4

https://bugzilla.kernel.org/show_bug.cgi?id=20902


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

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




--- Comment #9 from Justin Maggard <jmaggard10@...il.com>  2010-10-29 16:23:36 ---
I just ran into something similar a few days ago.  It was a 4TB filesystem with
about 50,000 files in a mixed data set.  I ran a test script that unmounted,
remounted, and then started writing 64MB files in a loop using dd.  With
delalloc on, the third 64MB write after umount/mount always took about 150
seconds.  With delalloc off, the first write always took ~150 seconds.  Writes
after that were a fraction of a seconds.

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