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Date:	Thu, 4 Feb 2010 04:16:44 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 14830] When other IO is running sync times go to 10 to 20
 minutes

http://bugzilla.kernel.org/show_bug.cgi?id=14830





--- Comment #17 from Michael Godfrey <godfrey@....stanford.edu>  2010-02-04 04:16:40 ---
I have now set deadline for all tests, and I had
a chance to try a system just like the one I have been
using, but with an 8.1T ext4 partition instead of the
11T partition before.

I used the same load:  rsync  /aaa /bbb, where /aaa was
NFS-mounted.
The behavior was quite similar, but the longest sync
time was about 4 minutes.

This suggests that the size of the filesystem is an
important factor.  Increasing the filesystem size by 36%
more than doubled the sync time.

Th size of the database in the 2 systems was somewhat larger
in the 11T system, but part of that was unused in the transfer.

Michael

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