linux-kernel - Re: Too many poll_idle cpu calls in kernel 3.2 rc-series

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Message-ID: <20111128204412.GM24062@one.firstfloor.org>
Date:	Mon, 28 Nov 2011 21:44:12 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Nicolas Kalkhof <nkalkhof@....de>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	deepthi@...ux.vnet.ibm.com
Subject: Re: Too many poll_idle cpu calls in kernel 3.2 rc-series

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
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