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RE: [Xen-devel] K8 Optimization disabled
| To: | "'Jerone Young'" <jyoung5@xxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] K8 Optimization disabled |
| From: | "Sylvain Coutant" <sco@xxxxxxxxxx> |
| Date: | Mon, 12 Dec 2005 17:53:50 +0100 |
| Cc: | 'xen-devel' <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Mon, 12 Dec 2005 16:55:22 +0000 |
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| In-reply-to: | <1134404864.7960.2.camel@xxxxxxxxxxxxxxxxxxxxx> |
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| Organization: | ADVISEO |
| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
| Thread-index: | AcX/ODHg5wyHoQ/zR3aCi9whgZIe4gAAbN/g |
> > 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@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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