RE: [Xen-devel] K8 Optimization disabled

["Sylvain Coutant" <sco@xxxxxxxxxx>]

> > I wonder why the "Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs."
> > Option is disabled in Xen's Linux kernel configs as shipped with 3.0.0 ?
>
> If you are talking about X86-64 Xen then it's because AMD is not the
> only game in town anymore. You have Intel too now. So you have to stay
> compatible for both. You can Optimize it on your own though, if you need
> the optimization that badly.

I just wanted to know why the option was there for EM64T and removed for K8 ... 
I believe this has something to do with IOMMU and K8-NUMA, but these one are 
still active (even if they break at compile time).

And yes, when running a farm of servers, each percent of CPU optimization is 
worth to be taken ;-)


Regards,

--
Sylvain COUTANT

ADVISEO
http://www.adviseo.fr/
http://www.open-sp.fr/



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