linux-kernel - Re: 50 Watt idle power regression bisected to Linux-3.10

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Date:	Sat, 07 Dec 2013 09:39:50 +0100
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Len Brown <lenb@...nel.org>
Cc:	tglx@...utronix.de, Peter Zijlstra <peterz@...radead.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jeremy Eder <jeder@...hat.com>, x86@...nel.org
Subject: Re: 50 Watt idle power regression bisected to Linux-3.10

On Sat, 2013-12-07 at 03:00 -0500, Len Brown wrote:

> No, Linux-3.13-rc3 does not fix this issue, even though it contains
> the following patch, claiming to address an issue with the commit above:
> 
> commit ea8117478918a4734586d35ff530721b682425be
> Author: Peter Zijlstra <peterz@...radead.org>
> Date:   Wed Sep 11 12:43:13 2013 +0200
> 
>     sched, idle: Fix the idle polling state logic
> 
>     Mike reported that commit 7d1a9417 ("x86: Use generic idle loop")
>     regressed several workloads and caused excessive reschedule
>     interrupts.

It fixes that, except for my Q6600 box.  Too bad mwait_idle() went away,
beloved old box doesn't play hints game, so it continues to flog itself.

-Mike

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