[Beowulf] Which Xeon supports NUMA?

[Carsten Aulbert]

Hi,

given that many core Xeons (especially quad and/or many socket systems) 
have some memory speed issues. With NUMA the kernel seems to be able to 
optimize this somehow. However, I have two questions:

(1) Which EM64T Xeon supports NUMA? I've searched a bit, but I have not 
found a definitive answer so far. Is this visible from /proc/cpuinfo?

(2) More importantly, has someone measured (how?) if this improves 
performance?

Thanks for a brief answer

Carsten