From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 15906] New: serious performance regression in "umount" on ext4
over LVM
Date: Tue, 4 May 2010 20:36:59 GMT
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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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