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by beagle3
3116 days ago
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I am not involved with k, and things might have changed significantly, but around the 2003-2005 timeframe, Arthur had very conclusive benchmarks that showed I-cache residence makes a huge difference (IIRC I-cache was just 8KB those days ...). The people who surely know what difference it makes today are Nial Dalton and Arthur Whitney. |
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That sounds quite plausible. The front-end of Intel processors (the parts that deal with making sure there is a queue of instructions ready to execute by the backend) has made some major advances since then. The biggest jumps were probably Nehalem in 2007, and then Sandy Bridge in 2009.
It's not that binary size no longer matters, but you almost have to go out of your way to make instruction cache misses be the tightest bottleneck on a hot path. And when it would be the bottleneck, the branch predictor and prefetch are so good that it's usually only a problem when combined with poor branch prediction, so it really only adds to the delay rather than causing it.