linux-kernel - Re: High CPU load when machine is idle (related to PROBLEM: Unusually high load average when idle in 2.6.35, 2.6.35.1 and later)

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Date:	Thu, 21 Oct 2010 04:57:48 -0400
From:	tmhikaru@...il.com
To:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Damien Wyart <damien.wyart@...e.fr>,
	Chase Douglas <chase.douglas@...onical.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Venkatesh Pallipadi <venki@...gle.com>
Subject: Re: High CPU load when machine is idle (related to PROBLEM: Unusually high load average when idle in 2.6.35, 2.6.35.1 and later)

On Thu, Oct 21, 2010 at 10:22:33AM +0200, Ingo Molnar wrote:
> 
> * tmhikaru@...il.com <tmhikaru@...il.com> wrote:
> 
> > On Wed, Oct 20, 2010 at 09:48:43PM -0400, tm@ wrote:
> > > On Wed, Oct 20, 2010 at 07:26:45PM +0200, Peter Zijlstra wrote:
> > > > 
> > > > 
> > > > OK, how does this work for people? I find my idle load is still a tad
> > > > high, but maybe I'm not patient enough.
> > > 
> > > I haven't had a chance to keep up with the topic, and I apologize. I'll be
> > > testing this as soon as I can finish compiling it. Thank you all for not
> > > letting this go unfixed.
> > > 
> > > Tim McGrath
> > 
> > Uhh, problem. This patch does not apply to git checkout
> > 74f5187ac873042f502227701ed1727e7c5fbfa9
> > 
> > which is the version of the kernel that first exhibits this flaw.
> > 
> > which version of the kernel does this patch apply cleanly to?
> 
> Try -tip (which includes the scheduler development tree as well):
> 
>    http://people.redhat.com/mingo/tip.git/README
> 
> Thanks,
> 
> 	Ingo

Tried that, patch still doesn't apply... and I just figured out why. Looks
like my email client is screwing the patch up. mutt apparently wants to chew
on my mail before I get it. viewing the mail as an attachment and saving it
works properly however.

Now that I have properly saved the mail, it applies cleanly to tip/master as
well as 74f5187ac873042f502227701ed1727e7c5fbfa9 - though in the latter's
case it's having to fuzz around a bit. I'll try testing
74f5187ac873042f502227701ed1727e7c5fbfa9 first since it's the one I *know*
is flawed, and I want to reduce the amount of changes that I have to test
for.

I'll build and test it, then let you guys know if there's any noticable
difference.

Tim McGrath

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