From: Andi Kleen <andi@firstfloor.org>
To: "Nicolas Kalkhof" <nkalkhof@web.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Too many poll_idle cpu calls in kernel 3.2 rc-series
Date: Mon, 28 Nov 2011 11:33:28 -0800 [thread overview]
Message-ID: <m28vn03uuv.fsf@firstfloor.org> (raw)
In-Reply-To: <1587582695.5658131.1322424808507.JavaMail.fmail@mwmweb005> (Nicolas Kalkhof's message of "Sun, 27 Nov 2011 21:13:28 +0100 (CET)")
"Nicolas Kalkhof" <nkalkhof@web.de> writes:
> the kernel v3.2 series shows excessive poll_idle calls during system idle phases causing the cpu
> (mobile i7 2620M) to heat up and draw additional 10% more power. All kernel versions between
> 3.2-rc1 and 3.2-rc3 are affected. Perf Top and Powertop both show the same issue.
> I've posted a similar bug report before: http://marc.info/?l=linux-kernel&m=132164909313594&w=2
> and used perf top -U to verify the poll_idle calls as requested.
So it didn't happen with earlier kernels?
I would suggest a git bisect in this case.
-Andi
--
ak@linux.intel.com -- Speaking for myself only
next prev parent reply other threads:[~2011-11-28 19:33 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-27 20:13 Too many poll_idle cpu calls in kernel 3.2 rc-series Nicolas Kalkhof
2011-11-28 19:33 ` Andi Kleen [this message]
2011-11-28 20:01 ` Srivatsa S. Bhat
2011-11-29 10:37 ` Deepthi Dharwar
-- strict thread matches above, loose matches on Subject: below --
2011-11-28 20:31 Nicolas Kalkhof
2011-11-28 20:44 ` Andi Kleen
2011-11-29 11:07 ` Deepthi Dharwar
2011-12-10 7:33 ` Mike Galbraith
2011-11-30 11:54 Nicolas Kalkhof
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