On Friday, September 26, 2014 03:09:05 PM Daniel P. Berrange wrote: > > 1. What happens on an overcommit for the number of guest CPUs? > > > > - For example, if I have a system with 2 sockets 4 cores each, > > what > > > > would happen if I have 2 guests, each one wanting 6 cores (assuming > > this is not in violation of the hw:cpu_max_cores)? > > 2. What happens on an overcommit on memory? > > The memory and CPU overcommit settings are still honoured when Nova > does NUMA placement. eg if you have a host with 2 NUMA nodes, each > with 4 physical CPUs and CPU overcommit ratio of x3, then Nova will > treat this as being a system with 2 NUMA nodes, each with 12 CPUs. > Similarly for memory overcommit. >
So in the scenario you describe above, each guest configuration would be constrained to one NUMA node (since the NUMA node would present itself logically as having 12 CPUs)? I was trying to think of a scenario where the guest configuration would have to split up among more than one NUMA node. Regards, Sean Toner _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : openstack@lists.openstack.org Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
