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    SubjectRe: stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest]
    On Mon, Feb 10, 2003 at 11:14:45PM +1100, Nick Piggin wrote:
    > Andrea Arcangeli wrote:
    >
    > >On Mon, Feb 10, 2003 at 10:53:27PM +1100, Nick Piggin wrote:
    > >
    > >>Andrew Morton wrote:
    > >>
    > >>
    > >>>Andrea Arcangeli <andrea@suse.de> wrote:
    > >>>
    > >>>
    > >>>>It's the readahead in my tree that allows the reads to use the max scsi
    > >>>>command size. It has nothing to do with the max scsi command size
    > >>>>itself.
    > >>>>
    > >>>>
    > >>>Oh bah.
    > >>>
    > >>>- *max_ra++ = vm_max_readahead;
    > >>>+ *max_ra = ((128*4) >> (PAGE_SHIFT - 10)) - 1;
    > >>>
    > >>>
    > >>>Well of course that will get bigger bonnie numbers, for exactly the
    > >>>reasons
    > >>>I've explained. It will seek between files after every 512k rather than
    > >>>after every 128k.
    > >>>
    > >>>
    > >>Though Andrea did say it is a "single threaded" streaming read.
    > >>
    > >
    > >yes, I pointed you to bonnie read sequential in bigbox.html, not
    > >tiobench.
    > >
    > The same pattern is also observed with single threaded tiobench
    > anyway.

    yes, of course.

    Andrea
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