Hi ,
Recently i migrated my sdn lab environment from ubuntu 16.04 to ubuntu 20.04. mininet in ubuntu 20.04 , running along with ryu controller simple_switch_13 application. Linear topology ,restrict the bandwidth with 5 mbps like below. self.addLink(s1, s2, cls=TCLink, bw=3) I run the IPERF UDP traffic test for 5mbps, it automatically reduces to 3mbps(path bandwidth) and not showing any packets loss.. i tried iperf, iperf3, ditg - all same result. mininet> h1 iperf3 -c h6 -u -b 5m Connecting to host 10.1.1.6, port 5201 [ 5] local 10.1.1.1 port 43817 connected to 10.1.1.6 port 5201 [ ID] Interval Transfer Bitrate Total Datagrams [ 5] 0.00-1.00 sec 424 KBytes 3.47 Mbits/sec 300 [ 5] 1.00-2.00 sec 356 KBytes 2.92 Mbits/sec 252 [ 5] 2.00-3.00 sec 356 KBytes 2.92 Mbits/sec 252 [ 5] 3.00-4.00 sec 355 KBytes 2.91 Mbits/sec 251 [ 5] 4.00-5.00 sec 356 KBytes 2.92 Mbits/sec 252 [ 5] 5.00-6.00 sec 356 KBytes 2.92 Mbits/sec 252 [ 5] 6.00-7.00 sec 355 KBytes 2.91 Mbits/sec 251 [ 5] 7.00-8.00 sec 356 KBytes 2.92 Mbits/sec 252 [ 5] 8.00-9.00 sec 356 KBytes 2.92 Mbits/sec 252 [ 5] 9.00-10.00 sec 355 KBytes 2.91 Mbits/sec 251 - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams [ 5] 0.00-10.00 sec 3.54 MBytes 2.97 Mbits/sec 0.000 ms 0/2565 (0%) sender [ 5] 0.00-10.19 sec 3.54 MBytes 2.91 Mbits/sec 0.062 ms 0/2565 (0%) receiver iperf Done. mininet> In ubuntu 16.04, i didnt observe this issue. Any one faced this issue? Thanks
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