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[Xen-users] XEN ans Windows SMP

To: "'Rob MacGregor'" <rob.macgregor@xxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-users] XEN ans Windows SMP
From: "Venefax" <venefax@xxxxxxxxx>
Date: Mon, 24 Nov 2008 08:01:35 -0500
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There is an amazing problem between XEN and Windows 2003 SMP. For instance, a 1 
CPU Windows VM takes 0.7 percent while running idle, but if you add a second 
CPU, still idle, the percentage shoots up to 3.6%. As a result, you can only 
have a few Windows SMP machines. Is there a solution to make the SMP simulation 
more efficient in XEN?

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Rob MacGregor
Sent: Monday, November 24, 2008 2:36 AM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] setting CPUs per socket in Xen?

On Mon, Nov 24, 2008 at 05:39, PattiMichelle <miche1@xxxxxxxxxxxxx> wrote:
> I am trying to figure out how to set the number of CPUs per socket in my
> VMs.  My install of Win2003Server Enterprise should support at least 16
> CPUs, but it sees only 8.  I was told this is because by default, Xen 3
> gives the guest OS vcpus at 1 per socket and W2k3E supports "8 sockets."
> How can I set Xen to give more than one CPU per socket?  I have 32 CPUs
> available (8 quad-core opterons).

See the thread titled "Windows and Multiple CPUS?", which was started
on the 19th of September:


                 Please keep list traffic on the list.

Rob MacGregor
      Whoever fights monsters should see to it that in the process he
        doesn't become a monster.                  Friedrich Nietzsche

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