1 |
I haven't been able to find clear info on Hyperthreading, but from what I |
2 |
can tell it appears that with Hyperthreading On; |
3 |
1. per core performance is slightly reduced |
4 |
2. you can run two threads per core, but there is some contention between |
5 |
threads |
6 |
|
7 |
So, generally, if you have less busy threads than cores, you should leave it |
8 |
off and if you have more busy threads than cores you should turn it on. |
9 |
|
10 |
Does that sound right? |
11 |
|
12 |
I assume that newer Nehalem/Core i7 HT (otherwise known as simultaneous |
13 |
multi-threading, SMT) just has less contention between threads than the |
14 |
older P4 HT, but the busy threads vs core principle remains. |