linux-kernel - Re: power increase issue on light load

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Message-ID: <BANLkTimEcPmH_XgLy5aEW+znwJyVZzfoCg@mail.gmail.com>
Date:	Fri, 1 Jul 2011 13:44:19 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	"Alex,Shi" <alex.shi@...el.com>
Cc:	ncrao@...gle.com, peterz@...radead.org, mingo@...e.hu,
	"Chen, Tim C" <tim.c.chen@...el.com>,
	"Li, Shaohua" <shaohua.li@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: power increase issue on light load

Hi,

On Thu, Jun 23, 2011 at 10:43 AM, Alex,Shi <alex.shi@...el.com> wrote:
> commit c8b281161dfa4bb5d5be63fb036ce19347b88c63 causes light load
> benchmark use more than 10% system power on platform NHM-EP and laptop
> Thinkpad T410 etc. The benchmarks are specpower and bltk office.
>
> I tried to track this issue, but only find deep C sate time reduced
> much, about from 90% to 30~40%, the C0 or C1 state increase much on
> different machines.
>
> Powertop just hints RES interrupts has a bit more. but when I try "perf
> probe native_smp_send_reschedule". I didn't find much.

I see the problem on -rc5 in my T410 too, the fan has been ringing always
and powertop reports "Wakeups-from-idle per second : 508.6".

thanks,
-- 
Ming Lei
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