netdev - Re: [PATCH: 2.6.13-15-SMP 3/3] network: concurrently runsoftirqnetwork code on SMP

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Date:	Tue, 25 Sep 2007 18:22:24 -0400
From:	jamal <hadi@...erus.ca>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	john ye <johny@...mco.com.cn>, David Miller <davem@...emloft.net>,
	netdev@...r.kernel.org, kuznet@....inr.ac.ru, pekkas@...core.fi,
	jmorris@...ei.org, kaber@...eworks.de, iceburgue@...il.com
Subject: Re: [PATCH: 2.6.13-15-SMP 3/3] network: concurrently
	runsoftirqnetwork code on SMP

On Tue, 2007-25-09 at 09:03 -0700, Stephen Hemminger wrote:

> There is a standard hash called RSS, that many drivers support because it is
> used by other operating systems. 

I think any stateless/simple thing will do (something along the lines
what 802.1ad does for trunk, a 5 classical five tuple etc).

Having solved the reordering problem in such a stateless way introduces
a loadbalancing setback; you may end sending all your packets to one cpu
(a problem Mr Ye didnt have when he was re-orderding ;->).

cheers,
jamal

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