EMT64 SMP Test

[Arjan van de Ven]

On Thu, 2004-10-28 at 19:18 +1000, Russell Coker wrote:
> On Thu, 28 Oct 2004 14:16, Jerone Young <jerone at gmail.com> wrote:
> > Try the FC3 X86_64 realease candidate (just look at archive on list)
> > and see if everything works out. I wouldn't mind seeing how much
> > slower the EMT64 is compared to a true X86_64 CPU like the AMD Opteron
> 
> How is an EMT64 not a "true X86_64"?  They both run the same code.

not entirely; em64t is missing a few instructions, has one difference in
behavior (which is unspecified so not a big deal) and has a few new
instructions compared to AMD64/Opterons. It also lacks an iommu which is
a bit of a pain if you have more than 4Gb of ram.

I'm not saying "worse" or "better" (both cpu platforms are quite
competitive), but stating that there is no difference also isn't
correct.


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