netdev - Re: [PATCH v2] RPS: Sparse connection optimizations

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Date:	Mon, 07 May 2012 09:22:20 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Deng-Cheng Zhu <dczhu@...s.com>
Cc:	Tom Herbert <therbert@...gle.com>, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2] RPS: Sparse connection optimizations - v2

On Mon, 2012-05-07 at 14:51 +0800, Deng-Cheng Zhu wrote:

> This is not about arch, it's about system design. Even with IRQ affinity
> working, for single queue NICs, RPS still has its value in this test.
> 

Post your numbers when proper affinities are done.

Having several cpus fighting on output path for qdisc/device lock is a
killer. Extra IPI are not worth the pain.



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