From: Andi Kleen <andi@firstfloor.org>
To: Nicolas Kalkhof <nkalkhof@web.de>
Cc: Andi Kleen <andi@firstfloor.org>,
linux-kernel@vger.kernel.org, deepthi@linux.vnet.ibm.com
Subject: Re: Too many poll_idle cpu calls in kernel 3.2 rc-series
Date: Mon, 28 Nov 2011 21:44:12 +0100 [thread overview]
Message-ID: <20111128204412.GM24062@one.firstfloor.org> (raw)
In-Reply-To: <492649473.3864850.1322512273580.JavaMail.fmail@mwmweb020>
On Mon, Nov 28, 2011 at 09:31:13PM +0100, Nicolas Kalkhof wrote:
> Andi,
>
> correct. The issue was introduced somewhere between 3.1 final and 3.2-rc1. I've tried to track down the bad commit but so far I haven't been successfull. The only workaround I found is to set the idle boot parameter to mwait and to disable CONFIG_INTEL_IDLE. Somehow the kernel seems to set idle to poll by default - no idea why :-(. I wonder if other mobile sandy bridge cpus are affected as well.
There are only a few changesets affecting drivers/idle
Can you try to git revert
46bcfad7a819bd17ac4e831b04405152d59784ab
4202735e8ab6ecfb0381631a0d0b58fefe0bd4e2
e978aa7d7d57d04eb5f88a7507c4fb98577def77
?
-Andi
next prev parent reply other threads:[~2011-11-28 20:44 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-28 20:31 Nicolas Kalkhof
2011-11-28 20:44 ` Andi Kleen [this message]
2011-11-29 11:07 ` Deepthi Dharwar
2011-12-10 7:33 ` Mike Galbraith
-- strict thread matches above, loose matches on Subject: below --
2011-11-30 11:54 Nicolas Kalkhof
2011-11-27 20:13 Nicolas Kalkhof
2011-11-28 19:33 ` Andi Kleen
2011-11-28 20:01 ` Srivatsa S. Bhat
2011-11-29 10:37 ` Deepthi Dharwar
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