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    SubjectRe: [patch v4 0/3] aio: implement request batching [more performance numbers]
    On Tue, Oct 06 2009, Jeff Moyer wrote:
    > Here's a mail I got from Nathan Roberts.
    >
    > Cheers,
    > Jeff
    >
    > ---
    >
    > Similar test as before. I had to re-upload the files so comparing
    > against last time isn't really apples-apples.
    >
    > Disk is a cciss logical drive consisting of 12 SATA drives in a RAID6
    > configuration with 128K stripes.
    >
    > Test case 1 is to read 1 million random 40K files (no file is read
    > more than once), 16 4K iocbs at a time, 100 threads.
    >
    > Test case 2 is the same except 100,000 128K files are read.
    >
    > Unit of measure is "files read per second".
    >
    >
    > 40K
    > -------------------------------------------------
    > Kernel NOOP
    > ------ ----
    > 2.6.30.5 682
    > 2.6.30.5 (w/o drop_caches) 718
    > 2.6.30.5+patch_v4 900
    > 2.6.30.5+patch_v4 (w/o drop caches) 965
    >
    >
    > 128K
    > -------------------------------------------------
    > Kernel NOOP
    > ------ ----
    > 2.6.30.5 242
    > 2.6.30.5 (w/o drop_caches) 350
    > 2.6.30.5+patch_v4 292
    > 2.6.30.5+patch_v4 (w/o drop caches) 420

    Nice numbers! The patch looks good to me from a quick look, if you want
    I can throw it into the testing mix tomorrow and see what kind of
    improvements I see here. With performance increase of that magnitude, we
    should get it in sooner rather than later.

    --
    Jens Axboe



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