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    SubjectRe: 2.6.4 ext3fs half order of magnitude slower than xfs - bulk write
    Matthias Andree <matthias.andree@gmx.de> wrote:
    >
    > Andrew Morton:
    >
    > > It should be possible to generate a simple testcase which demonstrates this
    > > problem on that machine. Is that something you can do?
    > >
    > > From your description, write-and-fsync.c from
    > >
    > > http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz
    > >
    > > would be a good starting point.
    >
    > I've run "write-and-fsync -m SIZE -f SOMEFILE" where size is given in
    > each section and SOMEFILE was chosen for some real-life but idle file
    > system. I hope this is what you meant. I did one run per test.

    Cannot reproduce, sorry. Kernel is 2.6.5-rc1, disk is a "MAXTOR 6L080J4"


    time write-and-fsync -m 256 -f foo

    writeback caching off, ext3/ordered:
    write-and-fsync -m 256 -f foo 0.00s user 1.19s system 4% cpu 24.247 total

    writeback caching off, XFS:
    write-and-fsync -m 256 -f foo 0.00s user 0.57s system 2% cpu 24.041 total

    writeback caching on, ext3/ordered:
    write-and-fsync -m 256 -f foo 0.00s user 1.16s system 14% cpu 8.169 total

    writeback caching on, XFS:
    write-and-fsync -m 256 -f foo 0.00s user 0.58s system 8% cpu 6.950 total
    write-and-fsync -m 256 -f foo 0.00s user 0.54s system 6% cpu 8.109 total
    write-and-fsync -m 256 -f foo 0.00s user 0.55s system 5% cpu 10.057 total
    write-and-fsync -m 256 -f foo 0.00s user 0.56s system 8% cpu 6.870 total

    (quite some variability in XFS)


    So... Maybe you could test some other disks or something?
    -
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