Re: Lockless page cache test results

Pavel Machek
2006-04-28T09:11:03Z

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.