By: Jouni Osmala (josmala.delete@this.cc.hut.fi), October 31, 2008 1:10 am
Room: Moderated Discussions
Core2 has more than one Icache fetch per retired instruction.
It means relatively high branch density in code, but it normally would indicate really catastrophicly bad branch predictor. Since in normal situations only way you get over 1 fetch per instruction is by branch missprediction.
Amd figures except for the anomaly of farcry_high&X3 are what should be expected. As number of accesses per instruction.
One possibility is that intel figures are from counting fetched instructions instead Icache fetches.
It means relatively high branch density in code, but it normally would indicate really catastrophicly bad branch predictor. Since in normal situations only way you get over 1 fetch per instruction is by branch missprediction.
Amd figures except for the anomaly of farcry_high&X3 are what should be expected. As number of accesses per instruction.
One possibility is that intel figures are from counting fetched instructions instead Icache fetches.
