On Tue, Nov 19, 2013 at 12:15:51PM +0000, Daniel P. Berrange wrote: > For attention of maintainers of Nova virt drivers Anyone from Hyper-V or VMWare drivers wish to comment on this proposal.... > A while back there was a bug requesting the ability to set the CPU > topology (sockets/cores/threads) for guests explicitly > > https://bugs.launchpad.net/nova/+bug/1199019 > > I countered that setting explicit topology doesn't play well with > booting images with a variety of flavours with differing vCPU counts. > > This led to the following change which used an image property to > express maximum constraints on CPU topology (max-sockets/max-cores/ > max-threads) which the libvirt driver will use to figure out the > actual topology (sockets/cores/threads) > > https://review.openstack.org/#/c/56510/ > > I believe this is a prime example of something we must co-ordinate > across virt drivers to maximise happiness of our users. > > There's a blueprint but I find the description rather hard to > follow > > https://blueprints.launchpad.net/nova/+spec/support-libvirt-vcpu-topology > > So I've created a standalone wiki page which I hope describes the > idea more clearly > > https://wiki.openstack.org/wiki/VirtDriverGuestCPUTopology > > Launchpad doesn't let me link the URL to the blueprint since I'm not > the blurprint creator :-( > > Anyway this mail is to solicit input on the proposed standard way to > express this which is hypervisor portable and the addition of some > shared code for doing the calculations which virt driver impls can > just all into rather than re-inventing > > I'm looking for buy-in to the idea from the maintainers of each > virt driver that this conceptual approach works for them, before > we go merging anything with the specific impl for libvirt. Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|