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    SubjectRe: [PATCH 0/8][RFC] IO latency/throughput fixes
    On Mon, Apr 06 2009, Linus Torvalds wrote:
    >
    >
    > On Mon, 6 Apr 2009, Jens Axboe wrote:
    > >
    > > > Jens - I can just apply this queue (I want to test it out anyway), or if
    > > > you prefer I can pull from you. Just tell me.
    > >
    > > Whatever you want, if you want to pull instead of manually applying,
    > > it's:
    > >
    > > git://git.kernel.dk/linux-2.6-block.git blk-latency
    >
    > Ok, I applied them for testing anyway, so I think I'll just keep the
    > series I have in my tree. I'm keeping my nasty "dd+sync" going in the

    No problem, the end result should be identical :-)

    > background, just to verify that things really feel better, but I'm already
    > convinced this is a winner. Especially with the request size limiter, I
    > can really read email _almost_ as if nothing else was going on on the
    > machine.
    >
    > With that request size limiting, my fsync pauses tend to be in the 250ms
    > range, with a one 0.75s outlier in the last few minutes. I can definitely
    > feel that quarter-second thing, and the .75s pause was a real stutter, but
    > boy what a difference. I don't get the uncontrollable urge to kill that
    > nasty background writer any more.

    If we can make the dd writer almost unnoticable, then I think we've come
    a long way already. That really is a nasty workload.

    --
    Jens Axboe



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