Re: [Xen-users] Changing CPUs-per-socket (Xen config file)?

["Andrew Lyon" <andrew.lyon@xxxxxxxxx>]

On Tue, Nov 18, 2008 at 3:40 PM, PattiMichelle <miche1@xxxxxxxxxxxxx> wrote:
> Hello:
> I'm looking for where to change the setting for the number of CPUs per
> socket in Xen (openSuSE11.0 x86_64).  I have a 32-processor machine (8
> quad-core opterons) and was told on bugzilla:
>
> "By default, xen exposes virtual CPUs as sockets as opposed to cores. w2k3
> EE only supports 8 sockets.
> You can edit your config file cpuid stanza to effectively set the number of
> cores per socket."
>
> I have Win2003Server Enterprise edition which I have verified will use at
> least 16 cores, but so far sees only 8 under Xen, irrespective of the
> setting I make in the KDE Xen VM manager applet.  Can anyone help me?  I
> don't know which config file this is referring to and what settings to make
> in the cpuid stanza.  I need to tell Xen to use between 2 and 4 cores per
> socket.
>
> THANKS!!!!!!!!!!!!!!!
> patti
>
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>

This setting will expose 8 core cpu's to the vm:

cpuid=['1:edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx,ebx=xxxxxxxx00010000xxxxxxxxxxxxxxxx','4,0:eax=001111xxxxxxxxxxxxxxxxxxxxxxxxxx']

Requires Xen 3.4.

Andy

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