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

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Date:	Thu, 15 Apr 2010 01:50:05 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...tta.com
Cc:	hadi@...erus.ca, eric.dumazet@...il.com, therbert@...gle.com,
	netdev@...r.kernel.org, robert@...julf.net, xiaosuo@...il.com,
	andi@...stfloor.org
Subject: Re: rps perfomance WAS(Re: rps: question

From: Stephen Hemminger <shemminger@...tta.com>
Date: Wed, 14 Apr 2010 12:44:26 -0700

> On Wed, 14 Apr 2010 14:53:42 -0400
> jamal <hadi@...erus.ca> wrote:
> 
>> Agreed. So to enumerate, the benefits come in if:
>> a) you have many processors
>> b) you have single-queue nic
>> c) at sub-threshold traffic you dont care about a little latency
> 
> There probably needs to be better autotuning for this, there is no reason
> that RPS to be steering packets unless the queue is getting backed up.

I disagree, if the goal is to migrate the bulk of packet processing
to where the app will actually sink and process the data then it should
forward to RPS marked cpus regardless of local queue levels.

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