>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 change the VMs' mtu from default to smaller to accommodate the >traffics, it works well. > >The way I have not find 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| >----- ----- ----- | ----- ----- ----- ----- > >_______________________________________________ >discuss mailing list >discuss@openvswitch.org >http://openvswitch.org/mailman/listinfo/discuss
Hi, There is currently no way to configure the MTU of a DPDK phy port at runtime. Theoretically, enabling jumbo frames and adjusting the dev's max_rx_pkt_len in the rte_eth_conf, (and consequently, the size of mbufs in the mempool) could work; however, OVS sets the MTU for all ports to the minimum of the non-datapath ports, so you might need to play around with it. This is something that I plan on looking at in the next few weeks (compile-time option, not runtime). Thanks, Mark _______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss
