linux-kernel - Re: PROBLEM: high load average when idle

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Message-ID: <4703D212.6040304@redhat.com>
Date:	Wed, 03 Oct 2007 13:32:02 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Arjan van de Ven <arjan@...ux.intel.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Anders Boström 
	<anders@...trom.dyndns.org>, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: Re: PROBLEM: high load average when idle

On 10/02/2007 07:26 PM, Arjan van de Ven wrote:
> On Tue, 02 Oct 2007 18:33:58 -0400
>> Or, everybody wakes up at once right when we are taking a sample.  :)
> 
> nice try but we sample every timer tick; this code being timer driven
> makes it what you say it is regardless of *which* timer tick it
> happens at ;)
> 

But we reduce the number of samples because some ticks just never
happen when the timers get rounded:

No rounding:

      tick ............... tick
     1 running            1 running

Rounded:

      tick
     2 running

In the first case the average is 1, but it's 2 in the second.

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