linux-ext4 - [Bug 15906] serious performance regression in "umount" on ext4 over LVM

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Date:	Wed, 5 May 2010 03:18:07 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15906] serious performance regression in "umount" on ext4 over
 LVM

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


Theodore Tso <tytso@....edu> changed:

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                 CC|                            |tytso@....edu




--- Comment #10 from Theodore Tso <tytso@....edu>  2010-05-05 03:18:02 ---
To be fair, there does seem to be a real problem here.  See my comment here:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/543617/comments/12

It looks like if there are dirty inodes, whatever writeback path is used by
umount(8) is much more inefficient than that used by sync(8).  Specifically it
seems to be doing a journal commit between each dirty inode which is flushed
out.

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