To NX or not to NX

Arjan van de Ven arjan at fenrus.demon.nl
Mon Jan 1 20:46:42 UTC 2007


> Are you certain the proc(s) really does/do support nx?  Intel chips are 
> infamous for reporting flags for features that they don't actually support.  
> For example, on this notebook:
> 
> # grep flags /proc/cpuinfo
> flags           : fpu vme de pse tsc msr pae mce cx8 mtrr pge mca cmov pat 
> pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
> 
> I know for certain that this proc does not support HyperThreading or PAE, but 
> there they are anyway.

your cpu DOES support PAE.... (really, it won't report it otherwise)

And it supports HT reporting (that is what "ht" means, it supports
reporting the number of siblings via cpuid, it's a very common
misperception of people to think it means your cpu has 2 hyperthreading
threads)






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