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    SubjectRe: NFS client latencies
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    On Thu, 2005-03-31 at 16:50 +0200, Ingo Molnar wrote:
    > * Ingo Molnar <mingo@elte.hu> wrote:
    >
    > > > So the overhead you are currently seeing should just be that of
    > > > iterating through the list, locking said requests and adding them to
    > > > our private list.
    > >
    > > ah - cool! This was a 100 MB writeout so having 3.7 msecs to process
    > > 20K+ pages is not unreasonable. To break the latency, can i just do a
    > > simple lock-break, via the patch below?
    >
    > with this patch the worst-case latency during NFS writeout is down to 40
    > usecs (!).
    >
    > Lee: i've uploaded the -42-05 release with this patch included - could
    > you test it on your (no doubt more complex than mine) NFS setup?

    This fixes all the NFS related latency problems I was seeing. Now the
    longest latency from an NFS kernel compile with "make -j64" is 391 usecs
    in get_swap_page.

    Lee

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