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    SubjectRe: getdents - ext4 vs btrfs performance
    On Wed, Feb 29, 2012 at 03:07:45PM +0100, Jacek Luczak wrote:

    [ btrfs faster than ext for find and cp -a ]

    > 2012/2/29 Jacek Luczak <difrost.kernel@gmail.com>:
    >
    > I will try to answer the question from the broken email I've sent.
    >
    > @Lukas, it was always a fresh FS on top of LVM logical volume. I've
    > been cleaning cache/remounting to sync all data before (re)doing
    > tests.

    The next step is to get cp -a out of the picture, in this case you're
    benchmarking both the read speed and the write speed (what are you
    copying to btw?).

    Using tar cf /dev/zero <some_dir> is one way to get a consistent picture
    of the read speed.

    You can confirm the theory that it is directory order causing problems
    by using acp to read the data.

    http://oss.oracle.com/~mason/acp/acp-0.6.tar.bz2

    -chris



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