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

["Ryan Burke" <burke@xxxxxxxxxxxxxxxxx>]

>> -----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
>>
>>

Sorry, brain fart. I saw AMD PV and was thinking AMD-V. Thanks.

Ryan


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