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    SubjectRe: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7
    On Thu, Apr 19 2007, Valerie Clement wrote:
    > Jens Axboe wrote:
    > >On Thu, Apr 19 2007, Valerie Clement wrote:
    > >>Jens Axboe wrote:
    > >>>Please tell me how you are running ffsb, and also please include a
    > >>>dmessg from a booted system.
    > >>>
    > >>Hi,
    > >>our mails crossed! please see my response to Andrew.
    > >>You could reproduce the problem with dd command as suggested, it's more
    > >>easy.
    > >>I'm sending you the dmesg info. For my tests I used the scsci sdc device.
    > >
    > >Thanks, it does. Can you try one thing for me? If you run the test on
    > >sdc, try doing:
    > >
    > ># echo 64 > /sys/block/sdc/queue/iosched/quantum
    > >
    > >and repeat the test.
    > >
    >
    > OK, that's done.
    >
    > With the change of quantum, the throughput scores are now a little bit
    > better in 2.6.21 than in 2.6.20.

    Wonderful, now try the patch I sent in the next mail and repeat the
    test.

    --
    Jens Axboe

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