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

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Message-Id: <201005042134.o44LYfHh023340@demeter.kernel.org>
Date:	Tue, 4 May 2010 21:34:41 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


keith mannthey <kmannth@...ibm.com> changed:

           What    |Removed                     |Added
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                 CC|                            |kmannth@...ibm.com




--- Comment #7 from keith mannthey <kmannth@...ibm.com>  2010-05-04 21:34:38 ---
Eric is spot on. 

At 2.6.30 and dm/lvm started supporting barriers, this can cause serious
performance issues depending on your configuration. 

Try mounting with the " -o nobarrier " option to see if your performance is
restored.

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