[RC5] SGI weird performance

Jim C. Nasby nasbjim at charlie.cns.iit.edu
Fri Jun 5 01:47:58 EDT 1998


The answer is on one of the FAQ pages. In short, the Intel chips and a few others have an instruction that is crucial to RC5 encoding, many
CPUs do not. So, x86 chips tend to do much better at RC5 than other CPUs. Wait for DES, the SGIs should rock at that :)

Moo!
dB!

Max wrote:

> Hi,
>
>     I am running rc5 version 2 clients on various machines, and I found some unexpected statistics :
>
> A Penitum II 300 Mhz gives around 800 000 k/sec
>
> A Silicon Graphics Origin 2000 with four MIPS processor gives around 250 000 k/sec
>
> A Silicon Graphics O2 R5000 gives around 140 000 k/sec
>
> That's slower than a Pentium 120 Mhz (Around 160 000 k/sec).
>
> Setting the processor usage on the client to 2 (normal priority) didn't change the numbers much.
> I even tried to open more than one session on the Origin, but as every session started the original one decreased of around 15 000 k/sec.
>
> Why are the SGI so slow ?? Other applications on them are way much faster than Intel machines ...
>
> Many thanks
> Max
>
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--
Jim C. Nasby (aka Decibel!)                                  /^\
nasbjim at charlie.cns.iit.edu                                 /___\
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