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Date: Fri, 1 Feb 2002 18:34:47 -0500 (EST)
From: Greg Boyce <gboyce@rakis.net>
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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: gmack@innerfire.net, Horst von Brand <brand@jupiter.cs.uni-dortmund.de>,
        <linux-kernel@vger.kernel.org>
Subject: Re: Machines misreporting Bogomips
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On Fri, 1 Feb 2002, Alan Cox wrote:

> > The machine is reporting that the cache is enabled.  Even if this was
> > true, I have trouble believing that turning on the cache would result in a
> > 50,000% increase in speed (4 bogomips compared to 500).
>
> L1 and L2 cache both disabled comes up as about 2.5 bogomips typically on
> a Pentium II/III.
>

Ahh.  I was working with someone else trying to figure out if the cache
would affect the calculated bogomips.  Looks like it would.

The machine I'm reporting shows 512K of cache though.  I included a second
machine as a comparison, and apparently choose poorly.  That was the
machine reporting no cache.

Would a machine with L1 cache disabled, but with 512K of L2 cache report
around 4 Bogomips, or would the performance hit not be that strong?

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