Re: [kvm-devel] White screen

[Dor L. <dor...@qu...>]

> Mark Clarkson wrote:
> > Hi,
> > When using WinXP I get a completely white screen whenever I change
the
> > resolution and just before the Windows GUI comes up, which lasts for
> > around 20 seconds.
>=20
> That is a known issue.  Windows is clearing the screen using mmio
> writes.  We have hacks to convert the mmio writes to regular RAM
writes,
> but they aren't effective for the screen clearing.  It is likely
> fixable, just haven't gotten around to it.
>=20
>=20
> > Also, as with Xen HVM, network performance is poor,
> > although it seems to be faster than WinXP under Xen. Do you expect
> > network performance to be good enough for server use in a guest in
the
> > future, maybe once the MMU has been improved, or will you go the
same
> > route as Xen and provide non-free guest network drivers?
> >
>=20
> We intend, at first, to improve fully virtualized performance as far
as
> we are able, without resorting to paravirtualized drivers.
>=20
> Should performance not be satisfactory to our needs, we may write
> paravirtualized devices and drivers.  If we do so, I can't commit as
to
> whether the paravirtualized Windows drivers will be open or not (I'm
not
> saying the drivers will be closed -- just that no decision has been
made).
>=20
> However, if you (or anyone) is interested in writing paravirtulized
> drivers, we will work with you towards merging them into the kernel
and
> into the kvm distribution.  We welcome such contributions and will
> cooperate fully.
>=20

Another future option would be to use hardware that support
virtualization.  There are already NICs (www.netxen.com) and HBAs that
provide segmented virtual NICs per VM. They are not wide spread but they
will be in the near future. The NIC vendor will provide the guest driver
and we will add the VMM side.
Until then para-virtualizes drivers will have to be used.

>=20
> --
> error compiling committee.c: too many arguments to function
>=20
>=20
>
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