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    SubjectRe: IO scheduler based IO controller V10
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    On Fri, 2009-10-02 at 07:24 -0700, Linus Torvalds wrote:
    >
    > On Fri, 2 Oct 2009, Jens Axboe wrote:
    > >
    > > It's really not that simple, if we go and do easy latency bits, then
    > > throughput drops 30% or more.
    >
    > Well, if we're talking 500-950% improvement vs 30% deprovement, I think
    > it's pretty clear, though. Even the server people do care about latencies.
    >
    > Often they care quite a bit, in fact.
    >
    > And Mike's patch didn't look big or complicated.

    But it is a hack. (thought about and measured, but hack nonetheless)

    I haven't tested it on much other than reader vs streaming writer. It
    may well destroy the rest of the IO universe. I don't have the hw to
    even test any hairy chested IO.

    -Mike



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