RE: [Xen-users] a new server for Xen

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: Ryan Burke [mailto:burke@xxxxxxxxxxxxxxxxx] 
> Sent: 01 March 2007 14:14
> To: Petersson, Mats
> Cc: Jan Albrecht; xin; xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-users] a new server for Xen
> 
> >
> >
> >> -----Original Message-----
> >> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> >> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> >> Jan Albrecht
> >> Sent: 01 March 2007 05:16
> >> To: xin
> >> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> >> Subject: Re: [Xen-users] a new server for Xen
> >>
> >> xin wrote:
> >> > Thanks for that. What about a VT-supported cpu to do the
> >> para-virtualization
> >> > instead of full-virtualization? which one is better.
> >> I've AMD PV and Intel VT here and from my point of view the
> >> VT are much
> >> better (and that's no matter if they're AMD, Intel or from 
> Mars...),
> >> because you can install an OS "out-of-box" to that server.
> >> With PV you're limited to Linux and to special kernels.  And the
> >> arguments Mats brought up may be right, but as long as you 
> do normal
> >> daily business on such a server (file-server, webserver, 
> etc...) at VT
> >> machine would always be the better choice.
> >
> > Sure, with VT (in my view obviously preferrably from AMD 
> ;-) ) you have
> > ALL the possibilites, rather than just half of them. I 
> should have said
> > so in my post.
> >
> > --
> > Mats
> 
> 
> I guess now I'm confused. I thought that AMD PV and Intel VT 
> did basically
> the same thing. They allowed unmodified OS's to work with a 
> hypervisor to
> support full vitrualization. From that Jan said it sounds 
> like there is a
> draw back of PV vs VT? I haven't heard anything about that. 
> Can someone
> explain (I personally prefer AMD)??

PV = Para-Virtualization -> modified kernel source-code to make virtual
kernel. 
VT = Virtualization Technology (from either AMD or Intel) allowing
UNMODIFIED OS kernels to run on Xen. AMD's technology is sometimes
called SVM or AMD-V, and the combined name for "VT" in Xen is "HVM",
which is short for "Hardware Virtual Machine (extensions)". 

If you look at my e-mail address, you see why I prefer AMD ;-)

--
Mats
> 
> Thanks,
> Ryan
> 
> 
> 



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