Hello all.
Has anyone got benchmark figures for the 1MB and 2MB L2-cache Prescott processors? They don't appear, as far as I can tell, on www.mersenne.org/bench
I get from the GMP benchmark work at http://swox.com/gmp/gmpbench.html that Prescott is perceptibly slower for the same code base than a same-MHz Northwood; on the other hand, the caches are bigger, and all you can reasonably get nowadays are Prescotts.
I presume that 64-bit integer arithmetic is of little help for GMP, since 53 bits of precision suffice, and an integer transform tends to involve modular arithmetic, requiring two or three 64x64 multiplies at half a dozen cycles each, rather than the single-cycle throughput of the SSE2 multiplier.
Tom
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