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[Neutron] NUMA aware VxLAN


Existing neutron ML2 support one VxLAN for tenant network. In NUMA case, VM 0 can be created in node 0 and VM 1 can be created in node 1 and VxLAN is in node 0.

VM1 need to cross node, which cause some performance downgrade. Does someone have this performance issue? Does Neutron community have plan to enhance it?
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