Here is a more precise phrasing of the question:
What would be the average speed decrease of a modern CPU when the speculative execution feature is disabled?
Post your opinions backed up by reasons. That is, don't just say "it would be about XX% decrease", you need to explain why are you estimating approx XX% speed decrease.
Apparently, the term "speculative execution" is not precisely defined. In the context of this question, we are talking about the strict meaning of speculative execution. Therefore, it is speculative execution following a conditional branch instruction, an indirect jump instruction or a return instruction. It does not include hardware transactional memory.
Also, don't worry about whether speculative execution can actually be disabled or not. That is a separate question.
You already have an active thread that
discusses this topic. Please use that one.
https://forums.anandtech.com/threads/speculative-execution-and-branch-prediction.2539383/
AT Mod Usandthem
What would be the average speed decrease of a modern CPU when the speculative execution feature is disabled?
Post your opinions backed up by reasons. That is, don't just say "it would be about XX% decrease", you need to explain why are you estimating approx XX% speed decrease.
Apparently, the term "speculative execution" is not precisely defined. In the context of this question, we are talking about the strict meaning of speculative execution. Therefore, it is speculative execution following a conditional branch instruction, an indirect jump instruction or a return instruction. It does not include hardware transactional memory.
Also, don't worry about whether speculative execution can actually be disabled or not. That is a separate question.
You already have an active thread that
discusses this topic. Please use that one.
https://forums.anandtech.com/threads/speculative-execution-and-branch-prediction.2539383/
AT Mod Usandthem
Last edited by a moderator:
