Hi Ilya and Eelco, Yiyang reports very poor TCP performance on his setup and I can also reproduce it on my machine. Somehow I think this might be a kernel issue, but I don't know where to debug this. Need your suggestion about how to debug.
So the setup is like the system-traffic, creating 2 namespaces and veth devices and attach to OVS. I do remember to turn off tx offload and ping, UDP, nc (tcp-mode) works fine. TCP using iperf drops to 0Mbps after 4 seconds. At server side: root@osboxes:~/ovs# ip netns exec at_ns0 iperf -s ------------------------------------------------------------ Server listening on TCP port 5001 TCP window size: 128 KByte (default) ------------------------------------------------------------ [ 4] local 10.1.1.1 port 5001 connected with 10.1.1.2 port 40384 Waiting for server threads to complete. Interrupt again to force quit. At client side root@osboxes:~/bpf-next# ip netns exec at_ns1 iperf -c 10.1.1.1 -i 1 -t 10 ------------------------------------------------------------ Client connecting to 10.1.1.1, TCP port 5001 TCP window size: 85.0 KByte (default) ------------------------------------------------------------ [ 3] local 10.1.1.2 port 40384 connected with 10.1.1.1 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0- 1.0 sec 17.0 MBytes 143 Mbits/sec [ 3] 1.0- 2.0 sec 9.62 MBytes 80.7 Mbits/sec [ 3] 2.0- 3.0 sec 6.75 MBytes 56.6 Mbits/sec [ 3] 3.0- 4.0 sec 11.0 MBytes 92.3 Mbits/sec [ 3] 5.0- 6.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 6.0- 7.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 7.0- 8.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 8.0- 9.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 9.0-10.0 sec 0.00 Bytes 0.00 bits/sec [ 3] 10.0-11.0 sec 0.00 Bytes 0.00 bits/sec (after this, even ping stops working) Script to reproduce ------------------------- ovs-vsctl -- add-br br0 -- set Bridge br0 datapath_type=netdev ip netns add at_ns0 ip link add p0 type veth peer name afxdp-p0 ip link set p0 netns at_ns0 ip link set dev afxdp-p0 up ovs-vsctl add-port br0 afxdp-p0 ovs-vsctl -- set interface afxdp-p0 options:n_rxq=1 type="afxdp" options:xdp-mode=native ip netns exec at_ns0 sh << NS_EXEC_HEREDOC ip addr add "10.1.1.1/24" dev p0 ip link set dev p0 up NS_EXEC_HEREDOC ip netns add at_ns1 ip link add p1 type veth peer name afxdp-p1 ip link set p1 netns at_ns1 ip link set dev afxdp-p1 up ovs-vsctl add-port br0 afxdp-p1 -- \ set interface afxdp-p1 options:n_rxq=1 type="afxdp" options:xdp-mode=native ip netns exec at_ns1 sh << NS_EXEC_HEREDOC ip addr add "10.1.1.2/24" dev p1 ip link set dev p1 up NS_EXEC_HEREDOC ethtool -K afxdp-p0 tx off ethtool -K afxdp-p1 tx off ip netns exec at_ns0 ethtool -K p0 tx off ip netns exec at_ns1 ethtool -K p1 tx off ip netns exec at_ns0 ping -c 10 -i .2 10.1.1.2 echo "ip netns exec at_ns1 iperf -c 10.1.1.1 -i 1 -t 10" ip netns exec at_ns0 iperf -s Thank you William _______________________________________________ dev mailing list d...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-dev