Hello, I'm testing the KNI with iperf and I discovered something strange. RX KNI and TX KNI seems to not be symmetrical (in term of latency jitter) and I don't understand why. I'm using iperf with low packet rate: This command is launch from a machine that is not running DPDK connected in point to point to a machine using a KNI interface: sudo iperf -c 10.0.0.2 -u -i 1 -t 3000 -l 54 -b 10368b -f b and the iperf server is launched on the machine with the KNI interface sudo iperf -s -u -i 1 And when I look at the jitter. The Jitter is always around 2.5ms but when I launch sudo iperf -c 10.0.0.2 -u -i 1 -t 3000 -l 54 -b 10368b -f b on the machine with the KNI interface and the server sudo iperf -s -u -i 1 on the non DPDK machine I have Jitter at around 0.002ms Can someone explain me what is the reason of this huge difference in term of jitter ? Regards, Antoine Pollenus