Great information, and straight from the source! Can you tell me on
which version of KVM support for TPR was implemented? I assume I am not up
to said version, but I want to confirm, because when I start my Windows
guests (currently all uniprocessor) in KVM, csrss.exe uses all available
processor constantly until I follow the KVM Windows ACPI workaround
directions. I have updated since December, but I am running Fedora 7 rpms,
so I may have to move up a version or two to get that support. Thanks,
Dustin
-----Original Message-----
From: Avi Kivity [mailto:[EMAIL PROTECTED]
Sent: Tuesday, May 20, 2008 11:55
To: [EMAIL PROTECTED]
Cc: [email protected]
Subject: Re: [Fedora-xen] HVM DomU on F9?
Dustin Henning wrote:
> I actually prefer to run HVM DomUs in a regular kernel if possible
> because I have always had mouse problems in Dom0 of F7, but not in the
base
> kernel. I understand that KVM is an option, but since Xen now supports
> Windows with ACPI (without the degradation that was once common in Xen and
> is still common in KVM because of a certain ACPI register apparently
> regularly polled by Windows [I would love to know what register, as I
could
>
It's called that Task Priority Register, or TPR.
> then try to find a way to prevent Windows from doing that and KVM might
> perform as well as Xen]), I feel that KVM would be a big step backwards.
>
For uniprocessor guests, kvm supports TPR optimization (since December
2007). It's disabled on SMP guests due to stability issues, unfortunately.
> Additionally, there are apparently more paravirtual drivers available for
> Windows (though they are not readily available in binary form and stable,
> more on that in my next message), though using std-vga in KVM is nice
(with
> standard VESA 2.0, a generic Windows driver already exists outside of the
> project).
A paravirtualized network driver is freely available for kvm. It is
still not fully stable under heavy loads, though. We expect to fix this
soon.
--
error compiling committee.c: too many arguments to function
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