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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Message-ID: <20101109185516.GQ8332@bombadil.infradead.org>
Date:	Tue, 9 Nov 2010 13:55:16 -0500
From:	Kyle McMartin <kyle@...artin.ca>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Venkatesh Pallipadi <venki@...gle.com>,
	Damien Wyart <damien.wyart@...e.fr>,
	Chase Douglas <chase.douglas@...onical.com>,
	Ingo Molnar <mingo@...e.hu>, tmhikaru@...il.com,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
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 Fri, Oct 29, 2010 at 09:42:23PM +0200, Peter Zijlstra wrote:
> 
> not tested other than compile, but how does that look...?
> 

Hi Peter,

I finally got around to building a test kernel for a user who had been
reporting this against F-14 (2.6.35) but they report there's not much
improvement.

Sorry. :/

<quote>
Date: Tue, 09 Nov 2010 12:46:53 -0600
From: Michael Cronenworth <mike@...tml.com>
To: test@...ts.fedoraproject.org
Subject: Re: Virtually impossible to keep load under 0.5 on idle desktop with
	F14+kms

On 11/09/2010 11:55 AM, Kyle McMartin wrote:
> http://kyle.fedorapeople.org/kernel/2.6.35.6-52.sched1.fc14/

Running this kernel is not any better. After leaving my system idle for 
10 minutes I finally saw it dip below 0.10, but after leaving the 
computer, and coming back 10 minutes later, I see a load of 0.25. No 
programs running.

Before I hit "send" on this message, I ran uptime again and got this:
$ uptime
  12:45:24 up 32 min,  3 users,  load average: 0.82, 0.43, 0.34

Thunderbird was the only program running. 99.8% idle.
</quote>

regards, Kyle
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