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

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Date:	Thu, 15 Apr 2010 08:10:28 -0400
From:	jamal <hadi@...erus.ca>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Tom Herbert <therbert@...gle.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	netdev@...r.kernel.org, robert@...julf.net,
	David Miller <davem@...emloft.net>,
	Changli Gao <xiaosuo@...il.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: rps perfomance WAS(Re: rps: question

On Wed, 2010-04-14 at 22:57 +0200, Eric Dumazet wrote:

> On my Nehalem machine (16 logical cpus), its NetXtreme II BCM57711E
> 10Gigabit has 16 queues. It might be good to use less queues according
> to your results on some workloads, and eventually use RPS on a second
> layering.

Ok Eric, you seem to be running a system with two Nehalems
interconnected by QPI.
Is there any difference, performance-wise, between redirecting from
coreX to coreY when they are on the same Nehalem vs when you
are going across QPI?

cheers,
jamal

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