Re: how is system geared down?

["Alexei Pytel" <pytel@xxxxxxxxxx>]

I am kind of tired to repeat that system was not slowed down.
CPW is based on a commercial mix which involves lots of database I/O.
System can have faster CPU but smaller CPW simply because it has limited
I/O bandwidth - less I/O slots, less disk drives.
In short - it's a smaller system.
If your application is CPU bound you can enjoy greater power of faster CPU
even if CPW is less.
Next - faster CPU may still be equipped with a smaller cache which will
make it run slower for some mixes.

Disclaimer - CPW or Mhz rating can not be a direct indicator of how well
your specific application will run - there are too many factors involved.

    Alexei Pytel

"Pessimist is nothing but a well-informed optimist"




                                                                                
                   
                    "Steve Richter"                                             
                   
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                    Sent by:                  Subject:     how is system geared 
down?              
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                    05/08/2001 06:08 PM                                         
                   
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Based on the numbers cited in prev msgs:
 "the model 170-2160 has a 100 Mhz Apache processor and a CPW rating of
114, while the model 170-2290 has a 200 Mhz Northstar processor and a CPW
rating of only 73"
it is obvious that the system is being geared down to meet the cpw targets.

Does anyone know how, where?

Is it slow memory, a slow bus or just a deliberately slowed clock?

Are the memory chips used in a power pc rs6000 usable in a power pc as400?

What about swapping memory chips between similar model as400s that have
different cpw ratings? Any volunteers to do that?

Would the performance results of a power pc assembler pgm, patched in using
sst, that uses register only operations ( no memory access ) to count to a
trillion show the actual clock speed of the cpu?

Steve Richter





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