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    SubjectRe: 2.6.39-rc3, 2.6.39-rc4: XFS lockup - regression since 2.6.38
    On Fri, May 20, 2011 at 05:20:18PM +0600, Andrey Rahmatullin wrote:
    > On Fri, Apr 29, 2011 at 11:19:29AM +1000, Dave Chinner wrote:
    > > > x4 ~ # xfs_info /
    > > > meta-data=/dev/root isize=256 agcount=4, agsize=1949824 blks
    > > > = sectsz=512 attr=2
    > > > data = bsize=4096 blocks=7799296, imaxpct=25
    > > > = sunit=128 swidth=128 blks
    > > > naming =version 2 bsize=4096 ascii-ci=0
    > > > log =internal bsize=4096 blocks=3808, version=2
    > > > = sectsz=512 sunit=8 blks, lazy-count=1
    > > > realtime =none extsz=4096 blocks=0, rtextents=0
    > > OK, so the common elements here appears to be root filesystems
    > > with small log sizes, which means they are tail pushing all the
    > > time metadata operations are in progress.
    > Does that mean that such filesystems are not optimal in terms of
    > performance and/or reliability and should have larger log sizes?

    Performance. Larger logs generally result in faster metadata
    performance, but it's really dependent on your workload and storage
    as to whether it makes any difference.

    Cheers,

    Dave.
    --
    Dave Chinner
    david@fromorbit.com


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