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Date: Mon, 15 Dec 2008 09:31:15 +0100
From: Arjan van de Ven <arjan@infradead.org>
To: "Shi, Alex" <alex.shi@intel.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: is it a timer bug?
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On Mon, 15 Dec 2008 16:19:37 +0800
"Shi, Alex" <alex.shi@intel.com> wrote:

> 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

unfortunately you don't give more than the first line ;-(



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