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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] [RFC] allow multi-core guests: introduce cores=
	option to -cpu
Date: Sat, 4 Jul 2009 06:58:13 +0100
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To: Andre Przywara <andre.przywara@amd.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org

On Saturday 04 July 2009, Andre Przywara wrote:
> Paul Brook wrote:
> >> currently SMP guests happen to see <n> vCPUs as <n> different sockets.
> >> Some guests (Windows comes to mind) have license restrictions and refuse
> >> to run on multi-socket machines.
> >> So lets introduce a "cores=" parameter to the -cpu option to let the
> >> user specify the number of _cores_ the guest should see.
> >
> > Sounds like this should be part of the -numa option.
>
> Sound reasonable on the first glance, but would make it rather
> complicated in real life. I suppose multi-core is far more interesting
> to most of the people than multi-node, so I would opt for the easier:
> -smp 2,cores=2 to specify a dual core guest.

I disagree. I think it makes a sense of the topology of nodes, cores and 
threads to all be specified in the same place. All the options you don't 
specify should have sensible defaults.

Paul