[Xen-devel] Re: Re: Install paravirtualized drivers after bootingforhigh-performance IO

["Arlen.D.Wang" <dengyu@xxxxxxxxxxxxxxxx>]

What is the difference between paravirtualized and virtualized?


DengYu  Wang



> Where is get  a reference to the Windows support using Vanderpool
> Technology ?

The code in the unstable tree is the best reference (if you feel brave).
There are the slides for a couple of talks about VT at the Xen Summit 
webpage
(http://summit.xensource.com/presentations/).

> Who is doing that Windows support using Vanderpool Technology ?

This implementation work has been spearheaded by Intel, although I think 
there
are also some people at IBM also working on Xen/VT (is that right?)

> If Xen can run unmodified Linux , then Xen can run unmodified Windows also
> , right ?

Not yet: running Windows requires emulating extra 16 bit x86 stuff that 
Linux
doesn't need in order to run.  There is a design for supporting this and it
might even be under development right now.

HTH,
Mark

> DengYu  Wang
>
> "Mark Williamson" <mark.williamson@xxxxxxxxxxxx>
> §Õ?:200505091257.04034.mark.williamson@xxxxxxxxxxxxxxx
>
> > Hi there,
> >
> > I expect you've seen a reference to the Windows support using Vanderpool
> > Technology?
> >
> > The current VT implementation provides an emulation of real hardware
> > devices
> > (e.g. an NE2000 ethernet card) to the guest OS.  This has the advantage
> > that
> > you can boot an unmodified OS and it'll recognise the emulated devices
> > and Just Work.  This will allow you to install the OS using its usual
> > installer
> > and get things up and running.
> >
> > However, you pay a performance price for emulating a device like this.
> > The
> > most straightforward way to solve this is to replace the emulated device
> > drivers with Xen-aware drivers (like the ones used by the Xen-native
> > Linux port).  Once you've installed the OS, you can upgrade to the Xen
> > device drivers.
> >
> > This should give better bandwidth for things like disk and network IO.
> >
> > Does that help?
> >
> > Cheers,
> > Mark
> >
> >>     What is "high-performance IO" ?
> >>     What meaning for "Install paravirtualized drivers after booting for
> >> high-performance IO"?
> >>
> >>     Thanks,
>
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