Bug 594484 - umount/sync performance fixes
umount/sync performance fixes
Status: CLOSED DUPLICATE of bug 601202
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel (Show other bugs)
All Linux
low Severity medium
: rc
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Assigned To: Eric Sandeen
Red Hat Kernel QE team
Depends On:
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Reported: 2010-05-20 15:48 EDT by Eric Sandeen
Modified: 2010-07-15 10:33 EDT (History)
1 user (show)

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Last Closed: 2010-07-15 10:33:03 EDT
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Description Eric Sandeen 2010-05-20 15:48:31 EDT
From https://bugzilla.kernel.org/show_bug.cgi?id=15906 -

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.

(note this does not have to be a loop device, any device will do)

Fixes in Jens Axboe's tree upstream:

Comment 1 RHEL Product and Program Management 2010-05-20 15:56:21 EDT
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
Comment 3 Mike Snitzer 2010-07-15 10:33:03 EDT
Fixes were included in RHEL6 kernel via bz#601202.

*** This bug has been marked as a duplicate of bug 601202 ***

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