Jecel Assumpcao Jr jecel@merlintec.com wrote:
My first ARM system was 4 mips (no cache at all, not even instruction pre- fetch) with 4Mb of slow ram. It scored 27% Dorado but was thoroughly usable
as
(600MHz / 8MHz) * 0.27 Dorados = 20.25 Dorados. That seems about right. Wasn't the ARM3 around 36MHz or something like that?
I've been reminded of the numbers and I misquoted (senility something or other . I forget). The ARM2 at 8MHz scored 87% Dorado, the ARM3 at 12MHz scored 125%. ARM2 had no cache at all, ARM3 had 4kb combined instruction/data cache. So the comparison would be
(600/8) * 87 -> 65~ Dorado or ~three times what I'm getting.
XScale at 600MHz has 16kb (?) each of instruction and data caches and a rather more modern memory interface than the ARM2.
tim -- Tim Rowledge, tim@sumeru.stanford.edu, http://sumeru.stanford.edu/tim Useful random insult:- One saucer short of a tea-service.