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[Qemu-devel] Re: [RFC] allow multi-core guests: introduce cores= option
[Qemu-devel] Re: [RFC] allow multi-core guests: introduce cores= option to -cpu
Sun, 5 Jul 2009 18:04:07 +0300
On Sun, Jul 05, 2009 at 05:53:17PM +0300, Avi Kivity wrote:
> On 07/05/2009 04:23 PM, Alexander Graf wrote:
>>> I thought of using -smp [processors=]2,cores=4,threads=2 (for a total
>>> of 16 threads), but I think it makes more sense with -cpu.
>> I actually think putting this in -smp makes more sense. -cpu really
>> shouldn't need to be touched by normal users and as long as you can
>> either -cpu host or -cpu safe that should be enough.
> Maybe. But in that case -cpu core2duo should imply cores=2 and -smp 2
> -cpu core2duo will bring up 4 cores spread across two sockets.
core2duo does not imply 2 cores. OSes use cpuid to discover this
>> But then again maybe we should replace -smp with something more useful
>> like -numa where you'd then specify #CPUs, #cores, mem-cpu connection,
> I'd prefer -numa to specify the memory topology (and connections of
> sockets to memory nodes), and -smp or -cpu to specify the intra-socket
I agree. -numa is a different story. It is possible to have zillion
socket setup without numa at all.
- [Qemu-devel] Re: [RFC] allow multi-core guests: introduce cores= option to -cpu, (continued)