linux-kernel - Re: high power consumption in recent kernels

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Message-ID: <20100910145451.GB21450@gamma.logic.tuwien.ac.at>
Date:	Fri, 10 Sep 2010 23:54:51 +0900
From:	Norbert Preining <preining@...ic.at>
To:	"Shi, Alex" <alex.shi@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"Chen, Tim C" <tim.c.chen@...el.com>,
	"arjan@...radead.org" <arjan@...radead.org>,
	"efault@....de" <efault@....de>,
	"Li, Shaohua" <shaohua.li@...el.com>, tglx <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: high power consumption in recent kernels

On Fr, 10 Sep 2010, Shi, Alex wrote:
> In the powertop source code, the "extra timer interrupt" come from /proc/timer_stats. If my understanding is correct, so many "extra timer interrupt" and the nohz_ratemlimit checking make your system can not go to deep C states. but don't know what the effect for "load balancing tick" come from "extra timer interrupt". So maybe reduce the "extra timer interrupt" is  helpful on your system. Could you like to try this? 

Can you be more specific how to do that?

- revert the nohz patch (can you send me a patch for that)
- how to reduce the "extra timer interrupt"?

Thanks

Best wishes

Norbert
------------------------------------------------------------------------
Norbert Preining            preining@...ist.ac.jp, logic.at, debian.org}
JAIST, Japan                                 TeX Live & Debian Developer
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