From: "Miquel van Smoorenburg" <miquels@cistron.nl>
Subject: Re: High load average on disk I/O on 2.6.17-rc3
Date: Mon, 8 May 2006 16:02:46 +0000 (UTC)
Organization: Cistron
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References: <200605051010.19725.jasons@pioneer-pra.com> <20060508152255.GF1875@harddisk-recovery.com> <1147102290.2888.41.camel@laptopd505.fenrus.org> <20060508154217.GH1875@harddisk-recovery.com>
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In article <20060508154217.GH1875@harddisk-recovery.com>,
Erik Mouw  <erik@harddisk-recovery.com> wrote:
>On Mon, May 08, 2006 at 05:31:29PM +0200, Arjan van de Ven wrote:
>> On Mon, 2006-05-08 at 17:22 +0200, Erik Mouw wrote:
>> > ... except that any kernel < 2.6 didn't account tasks waiting for disk
>> > IO.
>> 
>> they did. It was "D" state, which counted into load average.
>
>They did not or at least to a much lesser extent.

I just looked at the 2.4.9 (random 2.4 kernel) source code, and
kernel/timer.c::count_active_tasks(), which is what calculates the
load average, uses the same algorithm as in 2.6.16

Mike.

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