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    SubjectRe: [PATCH 0/2] cfq-iosched: fixing RQ_NOIDLE handling.
    Date
    Jeff Moyer <jmoyer@redhat.com> writes:

    > This, of course, raises the question of why the blk_yield patches didn't
    > run into the same problem. Looking back at some saved traces, I don't
    > see WBS (write barrier sync) requests, so I wonder if barriers weren't
    > supported by my last storage system.

    So, I tested Corrado's approach with -o nobarrier, and here are the
    results:

    fs_mark: 363.291 files/sec
    fio: 38.5 MB/s

    I don't have time to analyze the data right now, and it's 600MB worth of
    binary output. If you want, I can upload a representative sample
    somewhere, let me know.

    Anyway, I'll post an analysis tomorrow.

    Cheers,
    Jeff


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