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Mips chips/performance

To: riscy@pyramid.com (Mips 3000)
Subject: Mips chips/performance
From: Bill Broadley <broadley@neurocog.lrdc.pitt.edu>
Date: Tue, 10 Aug 1993 09:11:25 -0500 (EDT)
Reply-to: riscy@pyramid.com
Sender: owner-riscy@pyramid.com
Here's a little performance table:
        SpecINT Spec FP92       Mhz     Cache
Mips 3000 27.3  29.3    40      0+128k      Dec 5240 numbers
486/66    32    16      33/66   8k          Intel announcement*
4000PC    35    34      50/100  8k+8k       Sgi periodic chart
4200      55    30      40/80   8k+16k?     Nec Broshure (no details)*
4000SC    60    58      50/100  8k+8k+1MB   SGI periodic chart
Powerpc   60+   80+     66      32k         Motorolla ad *
Pentium   64.5  56.9    66      8k+8k       Intel announcement * 
R4400SC   97    88      75/150  16k+16k+1MB SGI periodic chart.

* = Spec numbers are probably obtained using an unmentioned 2nd level cache.

IMHO anything at the 4200 performance level or above looks great to me.

Question is how does the 4200 get it's speed?  It running 20% slower then the
mips 4000PC, and supposedly has longer pipelines, and less fp support.

Is it possible it supports a second level cache? Or it it just above a very
important 1st level cache threshold that gives it twice the perfomance of the
4200 for this benchmark? (I.e. in real world not faster then the 4000PC)

Or was the 4200 paired with some custom memory subsystem that implemented
a seperate cache controller for the 2nd level cache? 

Speculation welcome.
Bill                                    1st>    Broadley@neurocog.lrdc.pitt.edu
Broadley@schneider3.lrdc.pitt.edu <2nd  3rd>                 Broadley+@pitt.edu
Linux is great.         Bike to live, live to bike.                      PGP-ok


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