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Date: Wed, 06 Apr 2005 09:53:15 -0400
From: Greg Weeks <greg.weeks@timesys.com>
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To: David Frascone <dave@frascone.com>
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Cc: linuxppc-dev@ozlabs.org
Subject: Re: Bogomips?
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David Frascone wrote:

>Can this be right?  I'm getting This from a MPC-8260 (/proc/cpuinfo):
>
>------------------------------------------------
>cpu             : 82xx
>core clock      : 199 MHz
>CPM  clock      : 133 MHz
>bus  clock      : 33 MHz
>revision        : 1.1 (pvr 0081 0101)
>bogomips        : 133.12
>------------------------------------------------
>
>And this from a MPC-8540
>------------------------------------------------
>cpu             : e500
>revision        : 2.0 (pvr 8020 0020)
>bogomips        : 190.05
>Vendor          : Motorola SPS
>Machine         : mpc8540ads
>bus freq        : 666.666660 MHz
>PVR             : 0x80200020
>SVR             : 0x80300020
>PLL setting     : 0x4
>Memory          : 512 MB
>------------------------------------------------
>
>
>The second one looks way low . . . any ideas?
>  
>
Do you have cache turned on? Do you have branch prediction turned on? 
Branch prediction would be my guess as it's easy to miss.

Greg Weeks