linux-ext4 - [Bug 15906] serious performance regression in "umount" on ext4 over LVM

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Message-Id: <201005042105.o44L5P7K016070@demeter.kernel.org>
Date:	Tue, 4 May 2010 21:05:25 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15906] serious performance regression in "umount" on ext4 over
 LVM

https://bugzilla.kernel.org/show_bug.cgi?id=15906


Eric Sandeen <sandeen@...hat.com> changed:

           What    |Removed                     |Added
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                 CC|                            |sandeen@...hat.com




--- Comment #4 from Eric Sandeen <sandeen@...hat.com>  2010-05-04 21:05:24 ---
As I mentioned on the RH bz, it seems barrier-related.

I thought most barrier enhancements/changes were before 2.6.31, though.  Was
this really fast for you on .31?  Lots of lvm barrier changes went into .30.

mounting either the host fs, the loopback file, or both with "nobarrier" avoids
all the cache flushes from the barriers, and it's speedy again.

-Eric

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