Xen users - Nov 2010 - Changing how CPUS are presented to windows.

Is there a way to change how CPU''s are presented to Windows
VM''s? Example if you have a quad core cpu server that is 8 virtual
cpus, if you assign all 8 virtual cpus to a single windows server it is viewed
as 8 individual processors. Is there any way to have windows see it as 4 and not
8? The reason why is for SQL licensing. I am using open xen cloud.

Thanks,
Joe


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On 11/03/2010 09:01 AM, Joseph Coleman wrote:
> Is there a way to change how CPU''s are presented to Windows
VM''s?
> Example if you have a quad core cpu server that is 8 virtual cpus, if
> you assign all 8 virtual cpus to a single windows server it is viewed
> as 8 individual processors. Is there any way to have windows see it as
> 4 and not 8? The reason why is for SQL licensing. I am using open xen
> cloud.
I gues you are not using cpu and vcpus in you domu config file, like this:


vcpus       = ''4''
cpus        = ''1-7''

You can also play with xm vcpu-set and xm vcpu-pin.

>
> Thanks,
> Joe
>
>
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> 
> Is there a way to change how CPU''s are presented to Windows
VM''s?
Example if
> you have a quad core cpu server that is 8 virtual cpus, if you assign
all 8
> virtual cpus to a single windows server it is viewed as 8 individual
> processors. Is there any way to have windows see it as 4 and not 8?
The reason
> why is for SQL licensing. I am using open xen cloud.
> 
You need to tinker with cpuid config lines to change the way the CPU''s
are presented. There are some fairly sparse comments about it in the
example configs but I''m sure someone has written a wiki entry about it
somewhere.

James

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