Try to increase the window size with -w on the client. This will allow the operating system to accept the write and drop packets within the stack. If the window is too small the operating system will block the write until os buffers are available.
Bob On Fri, Jul 31, 2020 at 8:56 AM Zufar Dhiyaulhaq <zufardhiyaul...@gmail.com> wrote: > Hi Folks, > > I have a problem with iperf3, I try to simulate packet loss with Iperf3 > with increasing the bitrate above the bandwidth. But packet loss output not > increasing. > > Ubuntu 18.04 > Iperf 3.7.3 > > I don't know why this is happening? Is there any bug with Iperf? this > sounds stupid for me. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > *ubuntu@vm1:~$ iperf3 -c 192.168.0.92 --udp -t 20 --bitrate 9000m -R > -Viperf 3.7Linux vm1 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 > UTC 2020 x86_64Control connection MSS 1390Setting UDP block size to > 1390Time: Fri, 31 Jul 2020 15:53:39 GMTConnecting to host 192.168.0.92, > port 5201Reverse mode, remote host 192.168.0.92 is sending Cookie: > geu5ktrvwtalkelbszen5ym4rzxfp5xgzwdy Target Bitrate: 9000000000[ 5] > local 192.168.0.226 port 47999 connected to 192.168.0.92 port 5201Starting > Test: protocol: UDP, 1 streams, 1390 byte blocks, omitting 0 seconds, 20 > second test, tos 0[ ID] Interval Transfer Bitrate > Jitter Lost/Total Datagrams[ 5] 0.00-1.00 sec 13.8 MBytes 116 > Mbits/sec 0.081 ms 269/10704 (2.5%) [ 5] 1.00-2.00 sec 13.7 MBytes > 115 Mbits/sec 0.085 ms 0/10346 (0%) [ 5] 2.00-3.00 sec 13.6 > MBytes 114 Mbits/sec 0.035 ms 126/10365 (1.2%) [ 5] 3.00-4.00 sec > 12.8 MBytes 107 Mbits/sec 0.033 ms 279/9946 (2.8%) [ 5] 4.00-5.00 > sec 13.5 MBytes 113 Mbits/sec 0.051 ms 262/10427 (2.5%) [ 5] > 5.00-6.00 sec 13.2 MBytes 111 Mbits/sec 0.058 ms 0/9965 (0%) [ 5] > 6.00-7.00 sec 13.3 MBytes 111 Mbits/sec 0.044 ms 32/10047 (0.32%) > [ 5] 7.00-8.00 sec 13.0 MBytes 109 Mbits/sec 0.053 ms 43/9874 > (0.44%) [ 5] 8.00-9.00 sec 13.0 MBytes 109 Mbits/sec 0.042 ms > 34/9847 (0.35%) [ 5] 9.00-10.00 sec 13.6 MBytes 114 Mbits/sec > 0.055 ms 78/10305 (0.76%) [ 5] 10.00-11.00 sec 13.5 MBytes 113 > Mbits/sec 0.070 ms 0/10171 (0%) [ 5] 11.00-12.00 sec 13.1 MBytes > 110 Mbits/sec 0.047 ms 0/9851 (0%) [ 5] 12.00-13.00 sec 13.3 MBytes > 112 Mbits/sec 0.034 ms 0/10055 (0%) [ 5] 13.00-14.00 sec 13.4 > MBytes 112 Mbits/sec 0.040 ms 36/10136 (0.36%) [ 5] 14.00-15.00 sec > 13.9 MBytes 117 Mbits/sec 0.055 ms 437/10921 (4%) [ 5] 15.00-16.00 > sec 13.2 MBytes 111 Mbits/sec 0.043 ms 25/9964 (0.25%) [ 5] > 16.00-17.00 sec 13.2 MBytes 110 Mbits/sec 0.043 ms 21/9942 (0.21%) > [ 5] 17.00-18.00 sec 12.9 MBytes 108 Mbits/sec 0.046 ms 0/9702 > (0%) [ 5] 18.00-19.00 sec 13.4 MBytes 112 Mbits/sec 0.050 ms > 208/10294 (2%) [ 5] 19.00-20.00 sec 13.5 MBytes 113 Mbits/sec > 0.048 ms 0/10152 (0%) - - - - - - - - - - - - - - - - - - - - - - - - > -Test Complete. Summary Results:[ ID] Interval Transfer > Bitrate Jitter Lost/Total Datagrams[ 5] 0.00-20.04 sec 269 > MBytes 113 Mbits/sec 0.000 ms 0/203058 (0%) sender[ 5] 0.00-20.00 > sec 267 MBytes 112 Mbits/sec 0.048 ms 1850/203014 (0.91%) receiver* > > Thank you > > Best Regards, > Zufar Dhiyaulhaq > _______________________________________________ > Iperf-users mailing list > Iperf-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/iperf-users >
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