From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 15906] performance regression in "umount" of filesystems using
barriers
Date: Thu, 6 May 2010 03:49:03 GMT
Message-ID: <201005060349.o463n3Nf004098@demeter.kernel.org>
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--- Comment #17 from Dmitry Monakhov 2010-05-06 03:48:58 ---
(In reply to comment #15)
> The summary for this patch should probably be changed, yes? It should happen
> with filesystems other than ext4 that use barriers (i.e., btrfs, XFS), and it
> should happen on a single disk just as easily as a LVM. The latter I can
> confirm --- you can see the performance degradation quite easily on a single
> disk, so the mention of LVM in the summary is probably misleading.
Just a note, performance degradation is not that huge for XFS, as soon as i
understand this is because it batch several inode writes in to one 'log' so
less barriers required
But nor than less this is generic writeback issue.
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