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From: Ming Lei <tom.leiming@gmail.com>
To: "Alex,Shi" <alex.shi@intel.com>
Cc: ncrao@google.com, peterz@infradead.org, mingo@elte.hu, "Chen,
	Tim C" <tim.c.chen@intel.com>,
	"Li, Shaohua" <shaohua.li@intel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: power increase issue on light load
Date: Fri, 1 Jul 2011 13:44:19 +0800	[thread overview]
Message-ID: <BANLkTimEcPmH_XgLy5aEW+znwJyVZzfoCg@mail.gmail.com> (raw)
In-Reply-To: <1308797024.23204.95.camel@debian>

Hi,

On Thu, Jun 23, 2011 at 10:43 AM, Alex,Shi <alex.shi@intel.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

  parent reply	other threads:[~2011-07-01  5:44 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-23  2:43 Alex,Shi
2011-06-23  9:02 ` Peter Zijlstra
2011-06-24  0:41   ` Alex,Shi
2011-06-28  0:02     ` Alex,Shi
2011-06-28 14:59       ` Peter Zijlstra
2011-06-28 17:13         ` Nikhil Rao
2011-06-29  2:30           ` Nikhil Rao
2011-06-29  3:22             ` Alex,Shi
2011-06-29  6:55               ` Alex,Shi
2011-06-30  0:26                 ` Nikhil Rao
2011-06-30  8:38                   ` Alex,Shi
2011-06-30  0:07             ` Nikhil Rao
2011-06-30  8:34               ` Alex,Shi
2011-07-01  5:44 ` Ming Lei [this message]
2011-07-01 18:00   ` Nikhil Rao
2011-07-01 23:51     ` Ming Lei
2011-07-04  0:45     ` Alex,Shi

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