> I don't think it buys you much. People read too much into what > PEBS gives you. I can show you examples where PEBS > is worse than no PEBS.
Nothing is perfect in sampling, but the precise instructions event is definitely better in a range of situations. It avoids a lot of shadow effects. I think it's a good choice for a lot of situations, although on Ivy Bridge without EventingRip the BB walking is still fairly expensive. It would be a good default for the "user only asks for instructions for sampling and nothing else" situation, especially on Haswell which has EventingRip. But that's not straight forward to detect. -Andi -- a...@linux.intel.com -- Speaking for myself only. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
