My team is working on experiments looking at how far the Neutron server will scale, with increasing numbers of compute hosts and VMs. Does anyone have any datapoints on this that they can share? Or any clever hints? I'm already aware of the following ones: https://javacruft.wordpress.com/2014/06/18/168k-instances/ Icehouse 118 compute hosts 80 Neutron server processes (10 per core on each of 8 cores, on the controller node) 27,000 VMs - but only after disabling all security/iptables http://www.opencontrail.org/openstack-neutron-at-scale/ 1000 hosts 5000 VMs 3 Neutron servers (via a load balancer) But doesn't describe if any specific configuration is needed for this. (Other than using OpenContrail! :-)) Many thanks! Neil