Re: [Xen-devel] [PATCH] initialize some more cpuinfo fields

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 8 May 2006, at 14:10, Jan Beulich wrote:

> Namely preventing systems to look like single-socket ones with many 
> cores (because all CPUs show physical ID being
> zero).
Is it a problem to look like a many-core processor? Given that VCPUS 
can get moved around between physical CPUs to load-balance, it doesn't 
make much sense to take the physical IDs of CPUs that VCPUs happen to 
run on when they boot.
If the many-core appearance is a problem then we could synthesise 
different physical IDs for VCPUs (probably by forcing physical ID to 
VCPU number).
The only exception to this 'lie' could perhaps be domain0 in some 
situations, if we guarantee to run a dom0 VCPU on every physical CPU 
and never change the pinning. Then calling identify_cpu() for each VCPU 
makes sense, as does parsing SRAT data or otherwise obtaining NUMA info 
via a Xen hypercall.
 -- Keir


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