linux-ext4 - resize2fs shrink ext3 can be CPU limited

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Message-ID: <4D54ABCA.9020700@bitwagon.com>
Date:	Thu, 10 Feb 2011 19:23:54 -0800
From:	John Reiser <jreiser@...wagon.com>
To:	linux-ext4@...r.kernel.org
Subject: resize2fs shrink ext3 can be CPU limited

Hi,

When I use resize2fs to shrink a 153GB ext3 from about 53% full
to about 55% of its original size (thus becoming about 98% full),
then Pass 3, Scanning inode table, is CPU limited and a significant
fraction of elapsed wall-clock time (tens of minutes out of more than
an hour).  Being CPU-limited for such a duration seems peculiar to me.

The behavior is reproducible.  The details are at
  https://bugzilla.redhat.com/show_bug.cgi?id=676683
including reports from oprofile.

  resize2fs 1.41.12 (17-May-2010)
    input: 1071971/9863168 files (0.1% non-contiguous), 21597266/39423744
    output: The filesystem on /dev/sdc2 is now 22989038 blocks long.
real 69m52.167s
user 26m29.431s
sys 2m3.456s

[I'm not subscribed to this mailing list.]

-- 
John Reiser, jreiser@...Wagon.com
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