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Subject: Re: high power consumption in recent kernels
From: "Alex,Shi" <alex.shi@intel.com>
To: Norbert Preining <preining@logic.at>
Cc: Peter Zijlstra <peterz@infradead.org>,
        "Chen, Tim C" <tim.c.chen@intel.com>,
        "arjan@infradead.org" <arjan@infradead.org>,
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        "Zhao, Yakui" <yakui.zhao@intel.com>
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References: <1284355277.26157.8109.camel@debian>
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Date: Thu, 30 Sep 2010 08:50:41 +0800
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On Wed, 2010-09-29 at 22:39 +0800, Norbert Preining wrote:
> Hi Alex,
> 
> > Could you like to try the following patch on your system and see how
> > many power it consumption now?
> 
> But this patch is excately what you send me already and what I tried
> and I answered in the last email?
> 
> Do I miss something here?
> 
> All the best
> 
> Norbert
The following line is different, the new code remove the nohz_ratelimit
from irq_exit(). That may resolve your system too many interrupts
issue. 

+               arch_needs_cpu(cpu)|| (inidle && nohz_ratelimit(cpu))) {