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: Fri, 29 Oct 2010 16:23:41 GMT
Message-ID: <201010291623.o9TGNfZ7018396@demeter1.kernel.org>
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Justin Maggard changed:
What |Removed |Added
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CC| |jmaggard10@gmail.com
--- Comment #9 from Justin Maggard 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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