Dual channel DDR and the E7500 chipset
hahn at physics.mcmaster.ca
Sun Sep 8 12:10:12 PDT 2002
here's a somewhat obsessive investigation of how much prefetch distance
is useful for stream on my E7500:
that's a version of stream_d.c to which I've added simple uses of
__builtin_prefetch. best point is between 232 and 239 where scores
are 1381/1380/1610/1626 versus 1179/1177/1419/1418 for no prefetch.
the specific distance would necessarily depend on HW, clock,
memory latency, compiler, phase-of-moon, etc.
regards, mark hahn.
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