linux-ext4 - [Bug 15906] performance regression in "umount" of filesystems using barriers

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Message-Id: <201005060349.o463n3Nf004098@demeter.kernel.org>
Date:	Thu, 6 May 2010 03:49:03 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15906] performance regression in "umount" of filesystems using
 barriers

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





--- Comment #17 from Dmitry Monakhov <dmonakhov@...nvz.org>  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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