From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 15906] serious performance regression in "umount" on ext4 over
LVM
Date: Wed, 5 May 2010 03:18:07 GMT
Message-ID: <201005050318.o453I7nN027936@demeter.kernel.org>
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Theodore Tso changed:
What |Removed |Added
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CC| |tytso@mit.edu
--- Comment #10 from Theodore Tso 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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