Re: KVM and Xen

[Mike Chalmers]

On 12/31/06, Gilboa Davara <gilboad(a)gmail.com&gt; wrote:
>  On Sun, 2006-12-31 at 12:30 -0500, Mike Chalmers wrote:
>  > On 12/31/06, Gilboa Davara <gilboad(a)gmail.com&gt; 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?