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    SubjectRe: Tuning Linux for high-speed disk subsystems

    On Tue, 13 Nov 2001, Craig I. Hagan wrote:

    > > After some testing at Compaq's lab in Oslo, I've come to the conclusion
    > > that Linux cannot scale higher than about 30-40MB/sec in or out of a
    > > hardware or software RAID-0 set with several stripe/chunk sizes tried out.
    > > The set is based on 5 18GB 10k disks running SCSI-3 (160MBps) alone on a
    > > 32bit/33MHz PCI bus.
    > this isn't quite true. use either the RH kernel, the -ac series, or the
    > attached patch (for 2.4.15-pre4). Then set /proc/sys/vm/max-readahead to 511 or
    > 1023 (power of 2 minus 1)
    > this should allow you to generate large enough io's for streaming reads to do
    > what you are looking for.


    This patch is already on my pending list.

    So if Linus does not apply it, I will.

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