With a recent 5.15 kernel, passing a huge window size to iperf3 with lower MTUs makes iperf3 stop sending packets after a few seconds -- I haven't investigated this in detail, but the window size will be adjusted dynamically anyway and not passing it doesn't actually affect throughput, so simply drop the option. Signed-off-by: Stefano Brivio --- test/perf/passt_tcp | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/test/perf/passt_tcp b/test/perf/passt_tcp index 0db12ea..99d8fb1 100644 --- a/test/perf/passt_tcp +++ b/test/perf/passt_tcp @@ -141,19 +141,19 @@ tr TCP throughput over IPv6: host to guest bw - bw - ns ip link set dev lo mtu 1280 -iperf3c ns ::1 100${i}1 __THREADS__ __OPTS__ -w 4M +iperf3c ns ::1 100${i}1 __THREADS__ __OPTS__ iperf3s BW guest 100${i}1 __THREADS__ bw __BW__ 1.0 1.2 ns ip link set dev lo mtu 1500 -iperf3c ns ::1 100${i}1 __THREADS__ __OPTS__ -w 4M +iperf3c ns ::1 100${i}1 __THREADS__ __OPTS__ iperf3s BW guest 100${i}1 __THREADS__ bw __BW__ 2.0 3.0 ns ip link set dev lo mtu 9000 -iperf3c ns ::1 100${i}1 __THREADS__ __OPTS__ -w 8M +iperf3c ns ::1 100${i}1 __THREADS__ __OPTS__ iperf3s BW guest 100${i}1 __THREADS__ bw __BW__ 5.0 6.0 ns ip link set dev lo mtu 65520 -iperf3c ns ::1 100${i}1 __THREADS__ __OPTS__ -w 16M +iperf3c ns ::1 100${i}1 __THREADS__ __OPTS__ iperf3s BW guest 100${i}1 __THREADS__ bw __BW__ 6.0 6.8 ns ip link set dev lo mtu 65535 @@ -181,28 +181,28 @@ lat __LAT__ 500 350 tr TCP throughput over IPv4: host to guest ns ip link set dev lo mtu 256 -iperf3c ns 127.0.0.1 100${i}1 __THREADS__ __OPTS__ -w 1M +iperf3c ns 127.0.0.1 100${i}1 __THREADS__ __OPTS__ iperf3s BW guest 100${i}1 __THREADS__ bw __BW__ 0.3 0.5 ns ip link set dev lo mtu 576 -iperf3c ns 127.0.0.1 100${i}1 __THREADS__ __OPTS__ -w 1M +iperf3c ns 127.0.0.1 100${i}1 __THREADS__ __OPTS__ iperf3s BW guest 100${i}1 __THREADS__ bw __BW__ 0.5 1.0 ns ip link set dev lo mtu 1280 ns ip addr add ::1 dev lo -iperf3c ns 127.0.0.1 100${i}1 __THREADS__ __OPTS__ -w 4M +iperf3c ns 127.0.0.1 100${i}1 __THREADS__ __OPTS__ iperf3s BW guest 100${i}1 __THREADS__ bw __BW__ 2.0 3.0 ns ip link set dev lo mtu 1500 -iperf3c ns 127.0.0.1 100${i}1 __THREADS__ __OPTS__ -w 4M +iperf3c ns 127.0.0.1 100${i}1 __THREADS__ __OPTS__ iperf3s BW guest 100${i}1 __THREADS__ bw __BW__ 2.0 3.0 ns ip link set dev lo mtu 9000 -iperf3c ns 127.0.0.1 100${i}1 __THREADS__ __OPTS__ -w 8M +iperf3c ns 127.0.0.1 100${i}1 __THREADS__ __OPTS__ iperf3s BW guest 100${i}1 __THREADS__ bw __BW__ 5.0 6.0 ns ip link set dev lo mtu 65520 -iperf3c ns 127.0.0.1 100${i}1 __THREADS__ __OPTS__ -w 16M +iperf3c ns 127.0.0.1 100${i}1 __THREADS__ __OPTS__ iperf3s BW guest 100${i}1 __THREADS__ bw __BW__ 6.0 6.8 ns ip link set dev lo mtu 65535 -- 2.34.1