From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 15906] serious performance regression in "umount" on ext4 over
LVM
Date: Tue, 4 May 2010 21:05:25 GMT
Message-ID: <201005042105.o44L5P7K016070@demeter.kernel.org>
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Eric Sandeen changed:
What |Removed |Added
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CC| |sandeen@redhat.com
--- Comment #4 from Eric Sandeen 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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