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    SubjectRe: Performance regression in IO scheduler still there
    Date
    Corrado Zoccolo <czoccolo@gmail.com> writes:

    > Hi Jeff,
    > what hardware are you using for tests?
    > I see aggregated random read bandwidth is larger than sequential read
    > bandwidth, and write bandwidth greater than read.
    > Is this a SAN with multiple independent spindles?

    Yeah, this is a single path to an HP EVA storage array. There are 24 or
    so disks striped in the pool used to create the volume I am using. Jan,
    could you repeat your tests with /sys/block/sdX/queue/iosched/low_latency
    set to 0?

    Cheers,
    Jeff


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