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Fastest network setup for 10 Gbit

We currently are running a default Grizzly setup on Debian and would like to utilize our 10 Gbit network. However, our instances only provide 500 Mbit. We suspect the GRE tunnels for this limitation.

Hence, we want to setup a Havanna installation and are in search for the fastest network topology for our private single tenant cloud. Nova-network or Neutron? If Neutron, which driver/plug-in to choose (Tunneling, VLAN,...)?

Is FlatDHCP in multi-host mode with nova-network a good idea?

Is it even possible to get 10 Gbit without SR-IOV/PCI-passthrough?

Thanks in advance