Re: [libvirt] RFC: CPU counting in qemu driver

> > > > What does Xen / 'xm info' report on such a host ? > > > > nr_cpus : 48 > > nr_nodes : 1 > > sockets_per_node : 4 > > cores_per_socket : 12 > > threads_per_core : 1 > > node_to_cpu : node0:0-47 > > Hmm, this was for the default case when NUMA is turned off in hypervisor. > After setting numa=on on xen command line, the result is a bit different: > > nr_cpus : 48 > nr_nodes : 8 > sockets_per_node : 0 > cores_per_socket : 12 > threads_per_core : 1 > node_to_cpu : node0:0-5 > node1:6-11 > node2:12-17 > node3:18-23 > node4:24-29 > node5:30-35 > node6:36-41 > node7:42-47 > > > sockets_per_node is reported to be zero. Ah well that's completely broken. Could be they did the arithmetic nr_cpus / (nr_nodes * core_per_socket) and got 0.5 which with integer truncation gives 0. Guess Xen needs the same hack you're proposing for libvirt