23 Feb
1998
23 Feb
'98
7:05 p.m.
On Mon 23 Feb, Ian Piumarta wrote:
How big are your i/d caches? The jitter has lower locality than the bytecoded VM (for the moment, at least).
IIRC, the StrongARM has 16kb I & D caches, something like 32 way set associative. It could certainly be a major part of the problem if the code locality is low. In fact I guess I have so me evidence for that, since I tried a run with a VM compiled with the CCs c.s.e turned off and got a tiny increase in performance. This implies to me that the pc is jumping all over the place and the cache is not really getting to play the game. It's certainly a bit different to a 1Mb cache and big secondary caches; but then it's aimed at rather different markets than a PII! And it costs less than a PII socket...
tim
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Tim Rowledge: rowledge@interval.com (w) +1 (650) 856-7230 (w)
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