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    SubjectRe: [00/17] Large Blocksize Support V3
    William Lee Irwin III <> writes:
    >> In memory as on disk, contiguity matters a lot for performance.

    On Thu, Apr 26, 2007 at 12:21:24PM -0600, Eric W. Biederman wrote:
    > Not nearly so much though. In memory you don't have seeks to avoid.
    > On disks avoiding seeks is everything.

    I readily concede that seeks are most costly. Yet memory contiguity
    remains rather influential.

    Witness the fact that I'm now being called upon a second time to
    adjust the order in which mm/page_alloc.c returns pages for the
    sake of implicitly establishing IO contiguity (or otherwise
    determining why things are coming out backward now).

    -- wli
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