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: Thu, 4 Nov 2010 18:52:25 GMT
Message-ID: <201011041852.oA4IqP5U018110@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 #15 from Eric Sandeen <sandeen@redhat.com>  2010-11-04 18:52:22 ---
Could you capture a blktrace when this happens?

just:

# mount -t debugfs none /sys/kernel/debug
# blktrace -d /dev/blah -o mytrace &
# do your test
# killall blktrace
# tar cvjf mytrace.tar.bz2 mytrace* 

and attach it.  Might offer clues.

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