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    SubjectPerformance regression in IO scheduler still there
      Hi,

    I took time and remeasured tiobench results on recent kernel. A short
    conclusion is that there is still a performance regression which I reported
    few months ago. The machine is Intel 2 CPU with 2 GB RAM and plain SATA
    drive. tiobench sequential write performance numbers with 16 threads:
    2.6.29: AVG STDERR
    37.80 38.54 39.48 -> 38.606667 0.687475

    2.6.32-rc5:
    37.36 36.41 36.61 -> 36.793333 0.408928

    So about 5% regression. The regression happened sometime between 2.6.29 and
    2.6.30 and stays the same since then... With deadline scheduler, there's
    no regression. Shouldn't we do something about it?

    Honza
    --
    Jan Kara <jack@suse.cz>
    SUSE Labs, CR


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