 Re: Cache card for IIsi
Organization: CS Dept, University of Texas at Austin
Lines: 64
NNTP-Posting-Host: mohawk.cs.utexas.edu

> Can some people with cache cards PLEASE post speedometer numbers they
> get with the cards. I have only one report, which seems to indicate
> that a 32K cache card gives you only about a 1% speedup!! 

Ok.  I have a record that shows a IIsi with and without a 64KB cache.
It's small enough that I will attach it.

I have also measured some real programs with and without the 64 KB
cache.  The speedup varies a lot from app to app, ranging from 0% to
40%.  I think an average of 20%-25% is about right.  The subjective
difference is not great, but is sometimes noticable.  A simple cache
card certainly does not transform a IIsi into something enormously
better.  I do not have an FPU.

The conventional wisdom says that cache cards from all of the makers
offer about the same speedup and that there is not much difference
between 32K and 64K caches.  I bought mine from Third Wave for well
under $150.  I have had absolutely no problems at all with it.

If you get *complete* speedometer runs for a 32K cache, I'd like to
see them.  Let's check the conventional wisdom!  The so called
"Performance Rating" numbers by themselves are of no interest. 

Cheers.


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Peter Newton 
