netdev - Re: rps perfomance WAS(Re: rps: question

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Message-ID: <1271395106.16881.3645.camel@edumazet-laptop>
Date:	Fri, 16 Apr 2010 07:18:26 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	hadi@...erus.ca, Rick Jones <rick.jones2@...com>,
	David Miller <davem@...emloft.net>, therbert@...gle.com,
	netdev@...r.kernel.org, robert@...julf.net, andi@...stfloor.org
Subject: Re: rps perfomance WAS(Re: rps: question

Le vendredi 16 avril 2010 à 07:56 +0800, Changli Gao a écrit :
> On Fri, Apr 16, 2010 at 4:16 AM, jamal <hadi@...erus.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.



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