From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 20902] High IO wait when writing to ext4
Date: Wed, 24 Nov 2010 03:14:08 GMT
Message-ID: <201011240314.oAO3E8wS005828@demeter1.kernel.org>
References: <bug-20902-13602@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=20902





--- Comment #16 from Justin Maggard <jmaggard10@gmail.com>  2010-11-24 03:14:05 ---
Created an attachment (id=38002)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=38002)
blktrace showing initial write slowness

Here's mine.  My test case is mount, sleep 5, then do 10 x 128MB writes using
dd to the just-mounted filesystem.  The first 128MB write took over 20 seconds.
 Unfortunately I don't have access any more to the box where it took 150
seconds.

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