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: <88912.1290967623@localhost>
Date:	Sun, 28 Nov 2010 13:07:03 -0500
From:	Valdis.Kletnieks@...edu
To:	Damien Wyart <damien.wyart@...e.fr>
Cc:	Peter Zijlstra <peterz@...radead.org>, tmhikaru@...il.com,
	Venkatesh Pallipadi <venki@...gle.com>,
	Chase Douglas <chase.douglas@...onical.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Kyle McMartin <kyle@...artin.ca>
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 Sun, 28 Nov 2010 12:40:27 +0100, Damien Wyart said:
> Hi,
> 
> * Peter Zijlstra <peterz@...radead.org> [2010-11-27 21:15]:
> > How does this work for you? Its hideous but lets start simple.
> > [...]
> 
> Doesn't give wrong numbers like initial bug and tentative patches, but
> feels a bit too slow when numbers go up and down. Correct values are
> reached when waiting long enough, but it feels slow.

Umm.. maybe the code still averages the 1/5/15 over that many minute's
worth of ticks, which may be longer for a tickless kernel?  

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