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Re: To NX or not to NX

On Monday 01 January 2007 01:46pm, Arjan van de Ven wrote:
> > 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)

This CPU is a nearly 5 year old mobile Pentium4 (1.9GHz).  I know that PAE Xen 
kernels won't work on here whereas the non-PAE ones do.  Also, I didn't think 
any of the Pentium 4's suppored PAE until sometime in the last year or two.

> 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)

OK. I can see that.  Thanks for the info.
Lamont Peterson <lamont gurulabs com>
Senior Instructor
Guru Labs, L.C. [ http://www.GuruLabs.com/ ]

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