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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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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