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Message-ID: <1272810448.2173.31.camel@edumazet-laptop> Date: Sun, 02 May 2010 16:27:28 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: Arjan van de Ven <arjan@...radead.org> 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 Le dimanche 02 mai 2010 à 07:13 -0700, Arjan van de Ven a écrit : > > > > 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 ;) > > > # pwd /sys/devices/system/cpu/cpu15/cpuidle # grep . */* state0/desc:CPUIDLE CORE POLL IDLE state0/latency:0 state0/name:C0 state0/power:4294967295 state0/time:0 state0/usage:0 state1/desc:ACPI FFH INTEL MWAIT 0x0 state1/latency:1 state1/name:C1 state1/power:1000 state1/time:433855186 state1/usage:126869 state2/desc:ACPI FFH INTEL MWAIT 0x10 state2/latency:64 state2/name:C2 state2/power:500 state2/time:198095020416 state2/usage:76287744 C2 latency seems to be 64 (us ?), while C1 seems to be 1 BIOS Information Vendor: HP Version: I24 Release Date: 10/01/2009 # powertop PowerTOP 1.11 (C) 2007, 2008 Intel Corporation Collecting data for 5 seconds 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 -- 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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