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

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





--- Comment #17 from Dmitry Monakhov <dmonakhov@openvz.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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