Hi coders, 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 ? Regards, -- Sylvain COUTANT ADVISEO http://www.adviseo.fr/ http://www.open-sp.fr/ _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
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. On Mon, 2005-12-12 at 13:45 +0100, Sylvain Coutant wrote:> Hi coders, > > 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 ? > > > Regards, > > -- > Sylvain COUTANT > > ADVISEO > http://www.adviseo.fr/ > http://www.open-sp.fr/ > > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel >_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
> > 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/ _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel