Created attachment 240 [details] Topology Traffic stalls when running iperf3 traffic between two ports of test-pmd which are looped back using l2wd via memif in zero-copy mode. The same test works fine if zero-copy mode is disabled in l2fwd app. Topology used: (attached) test-pmd: arguments ./dpdk-testpmd -m 380 -l 6-8 --base-virtaddr 0x100000000 --huge-dir /mnt/huge1 --vdev 'net_memif0,role=server,socket-abstract=no,id=1,socket=/tmp/memif0.sock' --vdev 'net_memif1,role=server,socket-abstract=no,id=1,socket=/tmp/memif1.sock' --log-level=8 --log-level user1:8 --log-level user2:8 -- --nb-cores=2 --txd=1024 --rxd=2048 -i test-pmd: config set fwd io set portlist 0,2,1,3 start l2fwd: arguments ./dpdk-l2fwd -l 4-5 --proc-type=auto --no-pci --single-file-segments --vdev 'net_memif0,role=client,socket=/tmp/memif0.sock,socket-abstract=no,id=1,zero-copy=yes' --vdev 'net_memif1,role=client,socket=/tmp/memif1.sock,socket-abstract=no,id=1,zero-copy=yes' --file-prefix=container --log-level pmd.net.memif:8 -- -p 0x3 --no-mac-updating [test@localhost src]$ pwd /home/test/source/iperf-3.7/src [test@localhost src]$ ./iperf3 -c 120.0.0.10 -B 120.0.0.20 -M 1000 -t 2000 Connecting to host 120.0.0.10, port 5201 [ 5] local 120.0.0.20 port 50901 connected to 120.0.0.10 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 45.5 MBytes 382 Mbits/sec 164 20.3 KBytes [ 5] 1.00-2.00 sec 16.7 MBytes 140 Mbits/sec 78 12.5 KBytes [ 5] 2.00-3.00 sec 29.4 MBytes 247 Mbits/sec 136 20.3 KBytes [ 5] 3.00-4.00 sec 17.4 MBytes 146 Mbits/sec 128 9.65 KBytes [ 5] 4.00-5.00 sec 22.9 MBytes 192 Mbits/sec 103 29.9 KBytes [ 5] 5.00-6.00 sec 13.2 MBytes 111 Mbits/sec 68 23.2 KBytes [ 5] 6.00-7.00 sec 39.2 MBytes 329 Mbits/sec 159 7.72 KBytes [ 5] 7.00-8.00 sec 11.5 MBytes 96.5 Mbits/sec 47 19.3 KBytes [ 5] 8.00-9.00 sec 45.1 MBytes 378 Mbits/sec 146 10.6 KBytes [ 5] 9.00-10.00 sec 12.0 MBytes 101 Mbits/sec 74 15.4 KBytes [ 5] 10.00-11.00 sec 34.9 MBytes 293 Mbits/sec 130 4.82 KBytes [ 5] 11.00-12.00 sec 1.74 MBytes 14.6 Mbits/sec 9 988 Bytes [ 5] 12.00-13.00 sec 0.00 Bytes 0.00 bits/sec 1 988 Bytes [ 5] 13.00-14.00 sec 0.00 Bytes 0.00 bits/sec 0 988 Bytes [ 5] 14.00-15.00 sec 0.00 Bytes 0.00 bits/sec 1 988 Bytes [ 5] 15.00-16.00 sec 0.00 Bytes 0.00 bits/sec 0 988 Bytes [ 5] 16.00-17.00 sec 0.00 Bytes 0.00 bits/sec 0 988 Bytes ^C[ 5] 17.00-17.68 sec 0.00 Bytes 0.00 bits/sec 1 988 Bytes