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Message-ID: <20100502071324.1a95fdad@infradead.org>
Date: Sun, 2 May 2010 07:13:24 -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
>
> Cn Avg residency P-states (frequencies)
> C0 (cpu running) (68.9%) 2.93 Ghz 46.5%
> polling 0.0ms ( 0.0%) 2.80 Ghz 5.1%
> C1 mwait 0.0ms ( 0.0%) 2.53 Ghz 3.0%
> C2 mwait 0.0ms (31.1%) 2.13 Ghz 2.8%
> 1.60 Ghz 38.2%
I bet your system advertizes C2 with the same latency as C1,
but with lower power... which means Linux will pretty much never
pick C1.... no matter how much you take Andi's patch.
this is a bios thing... and until we put in the patch to override the
bios values (I can dust it off but it might need a bit of tweaking
since it was against .31) Andi's patch alone won't cut it... you also
need a non-lying bios ;)
--
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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