From: bugzilla-daemon@bugzilla.kernel.org
To: linux-ext4@vger.kernel.org
Subject: [Bug 15906] serious performance regression in "umount" on ext4 over LVM
Date: Tue, 4 May 2010 21:05:25 GMT [thread overview]
Message-ID: <201005042105.o44L5P7K016070@demeter.kernel.org> (raw)
In-Reply-To: <bug-15906-13602@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=15906
Eric Sandeen <sandeen@redhat.com> changed:
What |Removed |Added
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CC| |sandeen@redhat.com
--- Comment #4 from Eric Sandeen <sandeen@redhat.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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next prev parent reply other threads:[~2010-05-04 21:05 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-04 20:36 [Bug 15906] New: serious performance regression in "umount" on ext4 over LVM bugzilla-daemon
2010-05-04 20:37 ` [Bug 15906] " bugzilla-daemon
2010-05-04 20:41 ` bugzilla-daemon
2010-05-04 20:52 ` bugzilla-daemon
2010-05-04 21:05 ` bugzilla-daemon [this message]
2010-05-04 21:11 ` bugzilla-daemon
2010-05-04 21:12 ` bugzilla-daemon
2010-05-04 21:34 ` bugzilla-daemon
2010-05-04 21:48 ` bugzilla-daemon
2010-05-05 0:28 ` bugzilla-daemon
2010-05-05 3:18 ` bugzilla-daemon
2010-05-05 4:00 ` bugzilla-daemon
2010-05-05 4:46 ` bugzilla-daemon
2010-05-05 7:28 ` bugzilla-daemon
2010-05-05 8:27 ` Dmitry Monakhov
2010-05-05 8:40 ` Jens Axboe
2010-05-05 9:06 ` Dmitry Monakhov
2010-05-05 7:30 ` bugzilla-daemon
2010-05-05 19:44 ` bugzilla-daemon
2010-05-05 20:34 ` [Bug 15906] performance regression in "umount" of filesystems using barriers bugzilla-daemon
2010-05-05 21:36 ` Greg Freemyer
2010-05-05 20:34 ` bugzilla-daemon
2010-05-05 21:36 ` bugzilla-daemon
2010-05-05 21:55 ` Greg Freemyer
2010-05-06 3:49 ` bugzilla-daemon
2010-05-06 7:09 ` bugzilla-daemon
2010-05-06 7:10 ` bugzilla-daemon
2010-05-07 9:47 ` bugzilla-daemon
2010-05-08 14:30 ` bugzilla-daemon
2010-05-17 3:28 ` bugzilla-daemon
2010-05-17 3:44 ` bugzilla-daemon
2010-05-17 10:52 ` bugzilla-daemon
2010-05-19 18:57 ` bugzilla-daemon
2010-05-19 19:12 ` bugzilla-daemon
2010-05-21 1:05 ` bugzilla-daemon
2010-05-21 2:07 ` bugzilla-daemon
2010-05-21 6:08 ` bugzilla-daemon
2010-05-22 4:38 ` bugzilla-daemon
2010-05-26 16:44 ` bugzilla-daemon
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