Date: Tue, 2 Mar 2004 14:58:50 -0500 (EST)
From: "Richard B. Johnson" <root@chaos.analogic.com>
Reply-To: root@chaos.analogic.com
To: Chris Meadors <clubneon@hereintown.net>
cc: linux-kernel@vger.kernel.org
Subject: Re: Better performance with 2.6
In-Reply-To: <1078257097.7380.31.camel@clubneon.priv.hereintown.net>
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  <Pine.LNX.4.53.0403021406560.1166@chaos> <1078257097.7380.31.camel@clubneon.priv.hereintown.net>
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On Tue, 2 Mar 2004, Chris Meadors wrote:

> On Tue, 2004-03-02 at 14:10, Richard B. Johnson wrote:
>
> > Are you talking about BogoMips??  This is just how many twinkies
> > you can eat in a second with the current coding style in the
> > short timer counter. It has absolutely, positively, nothing to
> > do with "CPU capacity".
>
> He probably meant MHz.  But the same thing.  What difference does a
> tenth of a MHz matter?
>
> I do have a question about BogoMIPS.  I know they don't mean anything,
> but why on my Opteron system with two processors that read the same on
> the cpu MHz line, do my bogomips vary so much?
>
> processor       : 0
> cpu MHz         : 1393.980
> bogomips        : 2736.12
>
> processor       : 1
> cpu MHz         : 1393.980
> bogomips        : 3145.72
>

Because the loop-counter is called at different times, therefore
the cache has different stuff in it.

Cheers,
Dick Johnson
Penguin : Linux version 2.4.24 on an i686 machine (797.90 BogoMips).
            Note 96.31% of all statistics are fiction.


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