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

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Message-ID: <1271276855.16881.1756.camel@edumazet-laptop>
Date:	Wed, 14 Apr 2010 22:27:35 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	hadi@...erus.ca
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	Tom Herbert <therbert@...gle.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

Le mercredi 14 avril 2010 à 16:22 -0400, jamal a écrit :
> On Wed, 2010-04-14 at 12:44 -0700, Stephen Hemminger wrote:
> 
> > RPS might also interact with the core turbo boost functionality on Intel chips.
> > Newer chips will make a single core faster if other core can be kept idle.
> 
> how well does it work with Linux? Sounds like all i need to do is turn
> on some BIOS feature. 
> One of the negatives with multiqueue nics is because the core selection
> is static, you could end up overloading one core while others stay idle.
> This seems to steal cycle capacity from the idle cores and gives it to
> the busy cpus. nice. So i see it as a boost to multiqueue.

Only if more than one flow is involved.

And if you have many flows, chance they will spread several queues...



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