Messages in this thread | | | Date | Thu, 27 Mar 2008 11:43:59 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH 0/5] Generic smp_call_function(), improvements, and smp_call_function_single() |
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* Jens Axboe <jens.axboe@oracle.com> wrote:
> I very much wanted the kthread approach to work, since it's easier to > work with. It's not for lack of will or trying... I'll be happy to > supply you otherwise identical patches for this, the only difference > being kthread of IPI completions if you want to play with this.
i'd love to be able to run/pull something simple that enables me to replicate the measurements you did on a generic PC [without having to hit any real IO hardware which would put any context switching effects down into the noise category].
Obviously since the kthread approach embedds IPI sending it can never be as fast as a pure IPI approach - but it should still be reasonably fast. 3 usecs versus 2 usecs in a microbenchmark sounds about right to me, but it would be better to make it a better-sounding 2.5 usecs versus 2 usecs or so :-)
Ingo
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