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xen-devel
Re: [Xen-devel] [PATCH] xen, tools/python/xen: pincpu support, vcpus, ad
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To: |
"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>, "Mark Williamson" <mark.williamson@xxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] [PATCH] xen, tools/python/xen: pincpu support, vcpus, add vcpu to cpu map |
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From: |
Andrew Theurer <habanero@xxxxxxxxxx> |
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Date: |
Thu, 14 Apr 2005 14:33:04 -0500 |
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Cc: |
Ryan Harper <ryanh@xxxxxxxxxx>, Sam Gill <samg@xxxxxxxxxxxxx> |
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Thu, 14 Apr 2005 19:33:07 +0000 |
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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
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