Messages in this thread | | | Date | Thu, 27 Mar 2008 13:32:13 +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'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]. > > You can pull io-cpu-affinity or io-cpu-affinity-kthread from > git://git.kernel.dk/linux-2.6-block.git - or just see the two attached > patches, apply either one to current -git to test it.
another stupid question: what should i run in user-space to replicate your "3 usecs versus 2 usecs" result? io-affinity-ipi.patch seems to have no self-benchmarking capability at first sight. (I'd rather not try and cook up anything myself - i'd like to reproduce the workload you think is relevant for your IO affinity purposes.) Best would be to have a Kconfig based self-test that just runs during bootup if i boot a bzImage. (laziness rules - and this way i could also track performance regressions more easily, by looking at historic serial logs.)
Ingo
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