Just a note about this - I was reading about this issue a number of days ago and someone mentioned that AES may not actually be enabled even though it says that it is? I just can't imagine that dual 6-core L5640 processors would perform like this without something being wrong. I tried doling things out via numactl and that didn't have any impact to speak of.
I don't use this miner for cryptonight, but i did a test and it seems it don't uses AES-NI.
Claymore's miner gives me about 300 h/s and Wolf0's about 280 h/s. This one only 170 h/s (total).
This, with an 8core AMD FX at 4GHz.
Considering that my old PHENOM without AES-NI gave me about the same h/s per core, i imagine that this is the case.
Compiled your own? AMD CPU have been a challenge to get properly compiled. I can't do it as I don't have any AMDs.
AMD users have reported problems compiling with "-march=native". A couple of AMD users have posted tips in this
thread that may help. What's the L3 cache size? (see my previous post).