As following topology, two VMs communicate via VXLAN tunnel. TCP pkts may be droped for exceeding the MTU of host DPDK port in br2. Now I can decrease VMs' MTU to accommodate the traffics, it works well. The way I have not found to change MTU of DPDK phy port, is there a blueprint for supporting this by ovs, like "ovs-appctl netdev-dpdk/set-xxx" or another way? Host1 | Host2 (l-ip)- L3 -(r-ip) ----- ----- ----- | ----- ----- ----- ----- |VM1| --|br1|Vxlan --|br2|DPDK---DPDK|br2|--Vxlan|br2|--|br1|--|VM2| ----- ----- ----- | ----- ----- ----- ----- I forward this to dev mail-list, anyone who can response me? Thanks. _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev