netdev - Re: [PATCH v6] net: batch skb dequeueing from softnet input_pkt

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Date:	Mon, 03 May 2010 16:15:31 -0400
From:	jamal <hadi@...erus.ca>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>, xiaosuo@...il.com,
	therbert@...gle.com, shemminger@...tta.com, netdev@...r.kernel.org,
	lenb@...nel.org, arjan@...radead.org
Subject: Re: [PATCH v6] net: batch skb dequeueing from softnet
 input_pkt_queue

On Mon, 2010-05-03 at 00:08 +0200, Eric Dumazet wrote:

> 
> Test I did this week with Jamal.
> 
> We first set a "ee" rps mask, because all NIC interrupts were handled by
> CPU0, and Jamal thought like you, that not using cpu4 would give better
> performance.
> 
> But using "fe" mask gave me a bonus, from ~700.000 pps to ~800.000 pps
> 

I am seeing the opposite with my machine (Nehalem):
with ee i get 99.4% and fe i get 94.2% whereas non-rps
is about 98.1%.


cheers,
jamal

PS:- sorry dont have time to collect a lot more data - tommorow i could
do more.


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