[LUG] L3 Cache disabled

[Simon Waters <simon@xxxxxxxxxxxxxx>]

Noticed on one of our servers (SC1425) that the L3 cache is disabled 
according to lshw (lshw -C memory).

So far the DELL Poweredge Linux folk haven't come up with an answer.

So anyone know under what conditions L3 cache is enabled/disabled in Linux?

I assume this is deliberate, and due either to hardware choice, or SMP, 
or some other feature. But I can't find any discussion/explanation of L3 
cache above and beyond what it is, and some Linux changelogs saying it 
needed disabling on some AMD chips.

Machine has 2 x Intel(R) Xeon(TM) CPU 2.80GHz but I'd really like an 
explanation I can understand. Haven't tried reading the Linux source 
code, but the documentation didn't help me (although I might have missed 
some).



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