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by m0zg
2345 days ago
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It's a common misconception that cache is "low latency". It certainly is compared to main memory (which can take ~200 cycles before it stats feeding the CPU the bytes it wanted), but L3 hit can take 40-60 cycles easily as well, so it's not even an order of magnitude difference. By the time you're hitting L3, you're kind of already screwed. For perf, I'd much rather have larger L1, or a (much) bigger register file. |
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