Message-ID: <4703D212.6040304@redhat.com>
Date: Wed, 03 Oct 2007 13:32:02 -0400
From: Chuck Ebbert <cebbert@redhat.com>
Organization: Red Hat
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To: Arjan van de Ven <arjan@linux.intel.com>
CC: Andrew Morton <akpm@linux-foundation.org>,
       =?ISO-8859-1?Q?Anders_Bo?= =?ISO-8859-1?Q?str=F6m?= 
	<anders@bostrom.dyndns.org>,
       linux-kernel@vger.kernel.org, torvalds@linux-foundation.org
Subject: Re: PROBLEM: high load average when idle
References: <20071002.233731.119908363.anders@bostrom.dyndns.org>	<20071002150748.906970bc.akpm@linux-foundation.org>	<4702C756.8090108@redhat.com> <20071002162613.54c3ef43@laptopd505.fenrus.org>
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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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