Re: [Xen-devel] [PATCH] xen, tools/python/xen: pincpu support, vcpus, add vcpu to cpu map

[Andrew Theurer <habanero@xxxxxxxxxx>]

On Thursday 14 April 2005 14:23, Ian Pratt wrote:
> > > Yep. 'xm info' should give the total number of logical
> >
> > CPUs, then show
> >
> > > the hierarchy: nodes, sockets, cores, hyperthreads (in that
> > > order, which is how they should be enumerated to get the scalar
> >
> > CPU number).
> >
> > Any thoughts how this would work with hotplug cpu support (in
> > xen)?  Do we currently leave gaps in the cpu numbering for
> > missing cpus?
> >
> > For example, we have a 4 socket HT system with 2 chips
> > installed, available cpu id's may look like 0,1,3,4.
>
> Interesting point. What does Linux do? I guess it has a sparse set of
> CPU id's?

I believe once hotplug cpu went in Linux, that's when it got the sparse 
numbering. So, if you were to disable HT on a 4 socket Intel system, it 
might look like 0,2,4,6.  Maybe we don't need this for xen-3, but IMO, 
not a bad thing to keep in mind for a future release.

-Andrew

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel