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    SubjectRe: [PLEASE-TESTME] Zerocopy networking patch, 2.4.0-1

    On Tue, 9 Jan 2001, Jens Axboe wrote:

    > > > ever seen, this is why i quoted it - the talk was about block-IO
    > > > performance, and Stephen said that our block IO sucks. It used to suck,
    > > > but in 2.4, with the right patch from Jens, it doesnt suck anymore. )
    > >
    > > Thats fine. Get me 128K-512K chunks nicely streaming into my raid controller
    > > and I'll be a happy man
    >
    > No problem, apply blk-13B and you'll get 512K chunks for SCSI and RAID.

    i cannot agree more - Jens' patch did wonders to IO performance here. It
    fixes a long-standing bug in the Linux block-IO-scheduler that caused very
    suboptimal requests being issued to lowlevel drivers once the request
    queue gets full. I think this patch is a clear candidate for 2.4.x
    inclusion.

    Ingo

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