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    SubjectRe: [patch v4 0/3] aio: implement request batching [more performance numbers]
    On Tue, Oct 06 2009, Jeff Moyer wrote:
    > >> 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.
    >
    > I'd love it if you could run some benchmarks, thank you!

    So here's a pretty basic test. It does random reads from a bunch of
    devices, I tested both 4kb and 64kb block sizes. Queue depth used is 32
    for both cases, but note that this test uses a thread per device (so the
    queue depth is 32 per device). Results are averaged over 3 runs.
    slat/clat are the submission and completion latencies, they are in
    microseconds here.

    4kb random reads

    kernel sys IOPS slat clat
    ----------------------------------------------------
    2.6.32-rc3+patch 25.8% 192500 7.9 2606
    2.6.32-rc3 27.4% 191300 8.4 2612



    64kb random reads

    kernel sys IOPS slat clat
    ----------------------------------------------------
    2.6.32-rc3+patch 2.5% 24590 9.7 9681
    2.6.32-rc3 2.5% 24580 9.4 9691

    So pretty close, nothing earth shattering here. What the results above
    do not show is that the 4kb test runs very stable with your patch.
    Mainline fluctuates somewhat in the bandwidth, most likely due to the
    varying depth.

    --
    Jens Axboe



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