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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 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.

    Andrea
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