netdev - Re: [PATCH] rps: make distributing packets fairly among all the online CPUs default

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Message-ID: <412e6f7f1003230303l69fc142ey1581fff4c3e749be@mail.gmail.com>
Date:	Tue, 23 Mar 2010 18:03:22 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Tom Herbert <therbert@...gle.com>, netdev@...r.kernel.org,
	Ben Hutchings <bhutchings@...arflare.com>
Subject: Re: [PATCH] rps: make distributing packets fairly among all the 
	online CPUs default

On Tue, Mar 23, 2010 at 3:27 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le mardi 23 mars 2010 à 14:24 +0800, Changli Gao a écrit :
>> make distributing packets fairly among all the online CPUs default.
>>
>> Make distributing packets fairly among all the online CPUs default, then
>> users don't need any explicit configuration to get the benefit of RPS.
>>
>
> Some people want to dedicate a cpu to network interrupts, cache hits
> only, to get low latencies.
> RPS is not a win for all workloads.
>
> I think we should not change default without a knob.
>
> Didnt we discussed all this during last months ?
>

Ben Hutchings raised this question, but nobody replied with any message.

I do think distributing packets fairly among all the online CPUs will
helps most of users. I remember the smp_affinity of IRQ is the
online_cpu_mask be default.

-- 
Regards，
Changli Gao(xiaosuo@...il.com)
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