[neutron]Really need some help in network aspect

Hello, I'm not sure this is the right place, but I want to try whether if can I get any useful help. I stuck in some network problem for couple of days, and the problem I listed in https://github.com/projectcalico/calico/issues/4563 In short, the environment is kubernetes over openstack vm, and calico is kubernetes network componenet. However, the container to container network is very very slowly than host to host. So, I confused in questions: 1. Does kernel support double virturalization network? Like container network in vm 2. Is there any way to dig more? Sincerely, Yuan