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From: Nicholas N. <nj...@cs...> - 2008-03-07 20:24:15
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On Fri, 7 Mar 2008, Andi Kleen wrote: > But I doubt that any CPU you can find in the last 20 years or so > had a 12 cycle L1 latency. Especially not a x86 CPU. That would just be > horrible in performance. I tried Calibrator with an Athlon (K7 model 4) a few years back and got L1/L2 worst-case latencies of 12 cycles and 206 cycles. My understanding is that L1 misses costing ~10 cycles and L2 misses costing ~100 cycles or mroe (both in the worst case) is typical. That's why so much research has been done relating to cache performance. Nick |