netdev - Re: [PATCH net-next-2.6] net: speedup udp receive path

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Date:	Sat, 01 May 2010 07:29:39 -0400
From:	jamal <hadi@...erus.ca>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Changli Gao <xiaosuo@...il.com>,
	David Miller <davem@...emloft.net>, therbert@...gle.com,
	shemminger@...tta.com, netdev@...r.kernel.org,
	Eilon Greenstein <eilong@...adcom.com>,
	Brian Bloniarz <bmb@...enacr.com>
Subject: Re: [PATCH net-next-2.6] net: speedup udp receive path

On Sat, 2010-05-01 at 08:14 +0200, Eric Dumazet wrote:

> BTW, using ee mask, cpu4 is not used at _all_, even for the user
> threads. Scheduler does a bad job IMHO.

I have the opposite frustration ;->
I did notice it got used. My goal was to totally avoid using it, for
simple reason it is an SMT thread that shares same core as cpu0.
In retrospect i should probably set irq affinity then to cpu0 and 4.

> Using fe mask, I get all packets (sent at 733311pps by my pktgen
> machine), and my CPU0 even has idle time !!!

I will try this next time i get the chance.

cheers,
jamal

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