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    SubjectRe: [PATCH 0/4] linux-2.6-block: deactivating pagecache for benchmarks
    On Thu, Dec 01 2005, Dirk Henning Gerdes wrote:
    > Hi Jens!
    >
    > For doing benchmarks on the I/O-Schedulers, I thought it would be very
    > useful to disable the pagecache.
    >
    > I didn't want to make it so complicated so I just mark pages as
    > not-uptodate, so they have to be read again. Another reason was, that I
    > wanted to keep the conditions as near to reality as possible.
    >
    > Further I thought it would be useful, if you could turn the pagecache on
    > and off without rebooting the system.
    >
    > I implemented a proc-fs entry "/proc/benchmark/pagecache" for this.
    >
    > Probably this patch can be useful for anyone else, who wants to do some
    > benchmarks on block-layer stuff.
    > And if not, I would appreciate if you could have a look on it.

    This is rather odd, if you ask me, I don't like it. If you are doing
    serious benchmarking, you do it on a seperate disk / file system which
    you can just umount/mount before starting over. Or you reboot the
    machine in between.

    --
    Jens Axboe

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