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Date: Mon, 15 Dec 2008 16:19:37 +0800 From: "Shi, Alex" <alex.shi@...el.com> To: Arjan van de Ven <arjan@...radead.org> CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: RE: is it a timer bug? OK, but my machine is not a production machine. A, 2.6.28-rc8 with tickles and highres PowerTOP version 1.9 (C) 2007 Intel Corporation Cn Avg residency P-states (frequencies) C0 (cpu running) (65.1%) C1 0.0ms ( 0.0%) C2 105.8ms (34.9%) Wakeups-from-idle per second : 3.8 interval: 5.0s no ACPI power usage estimate available B, 2.6.28-rc8 with tickless only PowerTOP version 1.9 (C) 2007 Intel Corporation Cn Avg residency P-states (frequencies) C0 (cpu running) (14.0%) C1 0.0ms ( 0.0%) C2 3.4ms (86.0%) Wakeups-from-idle per second : 255.6 interval: 5.0s no ACPI power usage estimate available Top causes for wakeups: 87.9% (267.6) <interrupt> : extra timer interrupt C, 2.6.27 with tickless only: PowerTOP version 1.9 (C) 2007 Intel Corporation Cn Avg residency P-states (frequencies) C0 (cpu running) (53.8%) 2.53 Ghz 0.0% C1 0.0ms ( 0.0%) 2.53 Ghz 87.5% C2 243.0ms (46.2%) 2.40 Ghz 0.0% 1.60 Ghz 12.5% Wakeups-from-idle per second : 2.2 interval: 30.0s no ACPI power usage estimate available I have checked the /proc/interrupts, the interrupt 0 is really triggered too much times. Brgs Alex >-----Original Message----- >From: Arjan van de Ven [mailto:arjan@...radead.org] >Sent: 2008年12月15日 16:09 >To: Shi, Alex >Cc: linux-kernel@...r.kernel.org >Subject: Re: is it a timer bug? > >On Mon, 15 Dec 2008 15:07:17 +0800 >"Shi, Alex" <alex.shi@...el.com> wrote: > >> I notice the timer interrupts is quit high on the 2.6.28-rc8 kernel >> in my Nehalem machine. A, 180+/second timer interrupts in my Nehalem >> machine with tickless enable. B, the timer interrupts reduce to >> 10-/second with tickless and highres enable. On 2.6.27 kernel, the >> timer interrupts can keep low with tickless kernel whenever the >> highres feature is enable or not. So it is timer bug on my machine? >> > >Hi, > >can you give us the powertop output of these production Core i7 >machines? That is the most likely way to get a clue about what is going >on... > >Greetings, > Arjan van de Ven > >-- >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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