AMD FX "Bulldozer" Review - (4) !exclusive! Excuse for 1-Threaded Perf.

[dess]

I appreciate your efforts. However, it's likely that you're largely seeing the performance hit of the cache thrashing issue recently discovered since disabling a core in each module would prevent that contention.

Quite possible, and I hope so. There shouldn't be this much impact and then the lack of it... It's CMT, not SMT, after all.

Although, it could also be that by inactivating every second integer cluster power consumption went down and so the all-cores turbo could kick in, contributing significatnly to the results. So, I wonder if the turbo modes was disabled or not.

EDIT: here is a similar test (Googlish): http://translate.google.com/translat...-2%3Fstart%3D5

I'm a bit puzzled by what's the news here. You're basically proven an axiom : in any CPU were you have resource sharing among 2 threads, running only one ( thus giving it the whole resources ) it will run better.

No, you can't give it the whole resources on CMT.

If you take a Core 2 and disable 1 core, rest assured, the performance of that one thread will be better than running the same thread with both cores active.

Do you mean disabling the second thread on one core? Yes, with SMT the first thread will earn much.