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    SubjectRe: stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest]
    Is the following a fair summary?

    There is a certain minimum size required for the IOs to be cost
    effective. This can be determined by single reader benchmarking. Only
    readahead and not anticipatory scheduling addresses that.

    Anticipatory scheduling does not address the application that spends one
    minute processing every read that it makes. Readahead does.

    Anticipatory scheduling does address the application that reads multiple
    files that are near each other (because they are in the same directory),
    and current readahead implementations (excepting reiser4 in progress
    vaporware) do not.

    Anticipatory scheduling can do a better job of avoiding unnecessary
    reads for workloads with small time gaps between reads than readahead
    (it is potentially more accurate for some workloads).

    Is this a fair summary?


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