[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: [Xen-devel] K8 Optimization disabled


  • To: "'Jerone Young'" <jyoung5@xxxxxxxxxx>
  • 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
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • 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


 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.