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 14:36:21 -0400
From:	tmhikaru@...il.com
To:	Peter Zijlstra <peterz@...radead.org>,
	Damien Wyart <damien.wyart@...e.fr>,
	Chase Douglas <chase.douglas@...onical.com>,
	Ingo Molnar <mingo@...e.hu>,
	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 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

Now that I've actually had a chance to boot the kernel with the patch
applied I'm sorry to say but the load average isn't decaying as fast as it
ought to, at the very least. My machine's been idle for the last ten minutes
but the one minute average is still at 0.89 and shooting up to 1.5, the 5
min average is 0.9, and the 15 min average is .68 and climbing. Even as I'm
writing this the averages are continuing to drop, but *very* slowly.
Glacially, almost. The one minute average is continuing to randomly spike
high for no reason I can tell as well.

I'll let you guys know if this actually bottoms out at some point.

Tim McGrath

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