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

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Message-ID: <20100502105418.7abf83a7@infradead.org>
Date:	Sun, 2 May 2010 10:54:18 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>, hadi@...erus.ca,
	xiaosuo@...il.com, therbert@...gle.com, shemminger@...tta.com,
	netdev@...r.kernel.org, lenb@...nel.org
Subject: Re: [PATCH v6] net: batch skb dequeueing from softnet
 input_pkt_queue

On Sun, 02 May 2010 16:27:28 +0200
Eric Dumazet <eric.dumazet@...il.com> wrote:

> C2 latency seems to be 64  (us ?), while C1 seems to be 1

the processor_idle module has a "latency_factor" module parameter.
The default is 2, but sometimes people think 6 is a better value...
.. any chance you can try that value ?

Also, I'm starting to wonder if Andi's patch to use io_schedule() needs
to be replaced with a net_schedule() kind of thing. The cpuidle code
currently has a weight factor for IO (based on measuring/experiments),
and maybe networking really needs another factor... so just having a
parallel concept with a different weight could be the right answer for
that.

> 
> Your CPU supports the following C-states : C1 C2 C3 
> Your BIOS reports the following C-states : C1 C2 
> 
> C3 seems to be disabled in BIOS

btw this C2 == marketing name C3, and C3 == marketing name C6

(too many translations ;-)

we'll fix powertop to report the marketing name soon.

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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