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    SubjectRe: [PATCH 00/26] AIO performance improvements/cleanups, v2
    On Mon, Dec 03 2012, Kent Overstreet wrote:
    > Last posting: http://thread.gmane.org/gmane.linux.kernel.aio.general/3169
    >
    > Changes since the last posting should all be noted in the individual
    > patch descriptions.
    >
    > * Zach pointed out the aio_read_evt() patch was calling functions that
    > could sleep in TASK_INTERRUPTIBLE state, that patch is rewritten.
    > * Ben pointed out some synchronize_rcu() usage was problematic,
    > converted it to call_rcu()
    > * The flush_dcache_page() patch is new
    > * Changed the "use cancellation list lazily" patch so as to remove
    > ki_flags from struct kiocb.

    Kent, I ran a few tests, and the below patches still don't seem as fast
    as the approach I took. To keep it fair, I used your aio branch and
    applied by dio speedups too. As a sanity check, I ran with your branch
    alone as well. The quick results below - kaio is kent-aio, just your
    branch. kaio-dio is with the direct IO speedups too. jaio is my branch,
    which already has the dio changes too.

    Devices Branch IOPS
    1 kaio ~915K
    1 kaio-dio ~930K
    1 jaio ~1220K
    6 kaio ~3050K
    6 kaio-dio ~3080K
    6 jaio 3500K

    The box runs out of CPU driving power, which is why it doesn't scale
    linearly, otherwise I know that jaio at least does. It's basically
    completion limited for the 6 device test at the moment.

    I'll run some profiling tomorrow morning and get you some better
    results. Just thought I'd share these at least.

    --
    Jens Axboe



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