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    SubjectRe: Lockless page cache test results
    On St 26-04-06 15:53:10, Jens Axboe wrote:
    > Hi,
    >
    > Running a splice benchmark on a 4-way IPF box, I decided to give the
    > lockless page cache patches from Nick a spin. I've attached the results
    > as a png, it pretty much speaks for itself.
    >
    > The test in question splices a 1GiB file to a pipe and then splices that
    > to some output. Normally that output would be something interesting, in
    > this case it's simply /dev/null. So it tests the input side of things
    > only, which is what I wanted to do here. To get adequate runtime, the
    > operation is repeated a number of times (120 in this example). The
    > benchmark does that number of loops with 1, 2, 3, and 4 clients each
    > pinned to a private CPU. The pinning is mainly done for more stable
    > results.

    35GB/sec, AFAICS? Not sure how significant this benchmark is.. even
    with 4 clients, you have 2.5GB/sec, and that is better than almost
    anything you can splice to...
    Pavel
    --
    Thanks for all the (sleeping) penguins.
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