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    SubjectRe: Strange IDE performance change in 2.6.1-rc1 (again)
    Ram Pai <linuxram@us.ibm.com> wrote:
    >
    > 1) see whether you see a regression with files replacing the
    > cat command in your script with
    > dd if=big_file of=/dev/null bs=1M count=256

    You'll need to unmount and remount the fs in between to remove the file
    from pagecache. Or use fadvise() to remove the pagecache. There's a
    little tool which does that in

    http://www.zip.com.au/~akpm/linux/patches/stuff/ext3-tools.tar.gz

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