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    SubjectRe: [PATCH] livelock in elevator scheduling
    On Fri, Dec 01 2000, Russell Cattelan wrote:
    > > If performance is down, then that problem is most likely elsewhere.
    > > I/O limited benchmarking typically thrives on lots of request
    > > latency -- with that comes better throughput for individual threads.
    > >
    > > > Anyway, I'll try your patch.
    > Well this patch does help with the request starvation problem.
    > Unfortunately it has introduced another problem.
    > Running 4 doio programs, on and XFS partion with KIO buf IO turned on.

    This looks like a generic aic7xxx problem, and not block related. Since
    you are doing such nice traces, what is the other CPU doing? CPU1
    seems to be stuck grabbing the io_request_lock (for reasons not entirely
    clear from reading the aic7xxx source...)

    * Jens Axboe <>
    * SuSE Labs
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