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

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





--- Comment #9 from Kees Cook <kees@xxxxxxxxxxx>  2010-05-05 00:28:42 ---
Well, it seems to me that there is something wrong somewhere in here since
"sync; umount" takes seconds and "umount" alone takes minutes.  I can, however,
confirm that adding "-o nobarrier" causes the symptom to vanish.

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