linux-kernel - Re: Division of Load Average

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Message-ID: <20081001204311.241e04e5@infradead.org>
Date:	Wed, 1 Oct 2008 20:43:11 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	auntvini@....usyd.edu.au
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Division of Load Average

On Thu, 2 Oct 2008 06:58:45 -0400
auntvini@....usyd.edu.au wrote:

> My self and my superviosr Dr David Levy have been working on
> introduction of new kernel code to correct the inherent problem of
> calculating load avarage by the current kernel. We have posted many
> e-mails in this regard since 2003 and kernel has been updated under
> the supervision of Rusty Russel.
> 
> Also we had interactions with IBM group(balbir@...ibm.com)  who was
> engaged in delayed stat calculations.
> 
> We emphasise the following facts
> (1) seperation of Disk IO load from CPU load
> 
> This comes as a correction to the existing kernel as the calculation
> of the existing kernel load average is based on the arithmatic
> addition of Disk IO and CPU loads

while you can argue if including disk makes sense or not, it's 20+
years of tradition on Linux, and more on Unix.

So.. whatever you do (and I think there's some sense in splitting
things out).. please only *add* stats, don't replace the existing ones.

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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