Re: rps perfomance WAS(Re: rps: question

Eric Dumazet
2010-04-16T05:18:37Z

Le vendredi 16 avril 2010 à 07:56 +0800, Changli Gao a écrit :
> On Fri, Apr 16, 2010 at 4:16 AM, jamal <hadi@cyberus.ca> wrote:
> >
> > Sounds interesting.
> > Wikipedia information overload. Any arch description of the HP9000?
> > Did your scheme use IPIs to message the other CPUs?
> >
>
> If you doubt the cost of smp_call_function_single(), how about having
> a try with my another patch, which implements the similar of RPS, but
> uses kernel threads instead, so no explicit IPI.
>
> http://patchwork.ozlabs.org/patch/38319/
>
>

Come on Changli.

How do you wake up a thread on a remote cpu ?

To answer Jamal question, we need to answer to Jamal question, that is
timing cost of IPIS.

A kernel module might do this, this could be integrated in perf bench so
that we can regression tests upcoming kernels.