Re: [libvirt] RFC: CPU counting in qemu driver
On Tue, Nov 23, 2010 at 03:34:20PM +0100, Jiri Denemark wrote:
> > > 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
Daniel