From: bugzilla-daemon@bugzilla.kernel.org
To: linux-ext4@vger.kernel.org
Subject: [Bug 15906] New: serious performance regression in "umount" on ext4 over LVM
Date: Tue, 4 May 2010 20:36:59 GMT [thread overview]
Message-ID: <bug-15906-13602@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=15906
Summary: serious performance regression in "umount" on ext4
over LVM
Product: File System
Version: 2.5
Kernel Version: 2.6.33
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
AssignedTo: fs_ext4@kernel-bugs.osdl.org
ReportedBy: kees@outflux.net
Regression: Yes
As root, if /tmp is on an LV (or possibly even without this):
cd /tmp
dd if=/dev/zero of=test.ext4 bs=1 count=1 seek=1G
mkfs.ext4 -F test.ext4
mkdir -p /mnt/test
mount -o loop test.ext4 /mnt/test
echo $(seq 65536) | (cd /mnt/test; xargs touch)
time umount /mnt/test
Prior to 2.6.32, this took a second or so. Now it takes over a minute.
Reproduced in both Ubuntu 10.04 (2.6.32) and Fedora 12 (2.6.33).
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/543617
The current Ubuntu work-around is only useful on an otherwise idle system.
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next reply other threads:[~2010-05-04 20:37 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-04 20:36 bugzilla-daemon [this message]
2010-05-04 20:37 ` [Bug 15906] serious performance regression in "umount" on ext4 over LVM bugzilla-daemon
2010-05-04 20:41 ` bugzilla-daemon
2010-05-04 20:52 ` bugzilla-daemon
2010-05-04 21:05 ` bugzilla-daemon
2010-05-04 21:11 ` bugzilla-daemon
2010-05-04 21:12 ` bugzilla-daemon
2010-05-04 21:34 ` bugzilla-daemon
2010-05-04 21:48 ` bugzilla-daemon
2010-05-05 0:28 ` bugzilla-daemon
2010-05-05 3:18 ` bugzilla-daemon
2010-05-05 4:00 ` bugzilla-daemon
2010-05-05 4:46 ` bugzilla-daemon
2010-05-05 7:28 ` bugzilla-daemon
2010-05-05 8:27 ` Dmitry Monakhov
2010-05-05 8:40 ` Jens Axboe
2010-05-05 9:06 ` Dmitry Monakhov
2010-05-05 7:30 ` bugzilla-daemon
2010-05-05 19:44 ` bugzilla-daemon
2010-05-05 20:34 ` [Bug 15906] performance regression in "umount" of filesystems using barriers bugzilla-daemon
2010-05-05 21:36 ` Greg Freemyer
2010-05-05 20:34 ` bugzilla-daemon
2010-05-05 21:36 ` bugzilla-daemon
2010-05-05 21:55 ` Greg Freemyer
2010-05-06 3:49 ` bugzilla-daemon
2010-05-06 7:09 ` bugzilla-daemon
2010-05-06 7:10 ` bugzilla-daemon
2010-05-07 9:47 ` bugzilla-daemon
2010-05-08 14:30 ` bugzilla-daemon
2010-05-17 3:28 ` bugzilla-daemon
2010-05-17 3:44 ` bugzilla-daemon
2010-05-17 10:52 ` bugzilla-daemon
2010-05-19 18:57 ` bugzilla-daemon
2010-05-19 19:12 ` bugzilla-daemon
2010-05-21 1:05 ` bugzilla-daemon
2010-05-21 2:07 ` bugzilla-daemon
2010-05-21 6:08 ` bugzilla-daemon
2010-05-22 4:38 ` bugzilla-daemon
2010-05-26 16:44 ` bugzilla-daemon
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