KVM and Xen

[Gilboa Davara]

On Sun, 2006-12-31 at 13:21 -0500, Mike Chalmers wrote:
> On 12/31/06, Gilboa Davara <gilboad at gmail.com> wrote:
> > On Sun, 2006-12-31 at 12:30 -0500, Mike Chalmers wrote:
> > > On 12/31/06, Gilboa Davara <gilboad at gmail.com> wrote:
> > > > On Sat, 2006-12-30 at 18:15 -0500, Mike Chalmers wrote:
> > > > > I was wondering if anyone new about these and would explain them to me? Thanks.
> > > > >
> > > >
> > > > Short and simple.
> > > > Xen requires (in most cases *) a modified host and guest kernel and uses
> > > > its own management tools.
> > > > KVM requires certain extensions (Intel VT, AMD Pacifica/SVM **) to be
> > > > present on the host CPU and uses the QEMU front-end.
> > > >
> > > > As for what-to-use, well, a couple of questions:
> > > > A. What type of guest do you plan to virtualize? Windows? Linux? BSD?
> > > > B. Can you used kernel-modified guests?
> > > > C. Are you using VT/SVM enabled hardware?
> > > > D. Do you require additional features beyond "simple" virtualization?
> > > > (E.g. migration, snapshots, etc)
> > > >
> > > > - Gilboa
> > > > * Xen does support VT/SVN enabled hardware - but AFAIK it requires more
> > > > over-head then KVM.
> > > > ** Supported CPU cores:
> > > > Intel: P4 6xx, D9xx, Core Duo, Core 2 Duo, Xeon 3xxx/5xxx/7xxx.
> > > > AMD: Athlon64 AM2, AMD Opteron s1207/1xxx/2xxx/8xxx.
> > > >
> > > >
> > > > --
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> > > >
> > > Gilboa here is the answer to your questions. I would like to use KVM,
> > > if it is possible? Thanks.
> > > A. Windows
> > > B. don't know
> > > C. don't know (I am using a P4 3.0 ghz 800 mhz HT 478)
> > > D. don't know
> >
> > AFAIR the 478 P4 doesn't include the required VT extensions.
> > As such, only QEMU or VMWare Player/Server can be used to run unmodified
> > guests. (Read: Windows)
> > Both are free.
> > QEMU is slower, but GPL.
> > VMWare is (much) faster, but it's close source and as such, if it
> > breaks, your own your own. *
> >
> > - Gilboa
> > * Though in my experience, VMWare server is pretty stable.
> >
> >
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> >
> Gilboa, what about Xen?

Unless you replace the motherboard (LGA 775 and/or AM2) + CPU (P4/775,
CD/C2D, Athlon64AM, etc) + memory (DDR2), Xen can't be used to run
Windows.

Sorry :(
- Gilboa