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

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Date:	Thu, 15 Apr 2010 06:51:29 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Tom Herbert <therbert@...gle.com>, hadi@...erus.ca,
	Stephen Hemminger <shemminger@...tta.com>,
	netdev@...r.kernel.org, robert@...julf.net,
	David Miller <davem@...emloft.net>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: rps perfomance WAS(Re: rps: question

On Thu, Apr 15, 2010 at 4:57 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> RPS can be tuned (Changli wants a finer tuning...), it would be
> intereting to tune multiqueue devices too. I dont know if its possible
> right now.
>
> 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.

My idear is: run a daemon in userland to monitor the softnet
statistics, and tun the RPS setting if necessary. It seems that the
current softnet statistics data isn't correct.

Long time ago, I did a test, and the conclution was
call_function_single IPI was more expensive than resched IPI, so I
moved to kernel thread from softirq for packet processing. I'll redo
the test later.

-- 
Regards，
Changli Gao(xiaosuo@...il.com)
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