I am not able to interpret the following iPerf3 results.
Client:
iperf3 -c SERVER -u -R -b 350M
Connecting to host SERVER, port 5201
Reverse mode, remote host SERVER is sending
[ 5] local CLIENT port 47128 connected to SERVER port 5201
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-1.00 sec 37.2 MBytes 312 Mbits/sec 0.039 ms 0/26961 (0%)
[ 5] 1.00-2.00 sec 37.0 MBytes 310 Mbits/sec 0.061 ms 0/26782 (0%)
[ 5] 2.00-3.00 sec 33.6 MBytes 281 Mbits/sec 0.047 ms 0/24297 (0%)
[ 5] 3.00-4.00 sec 36.5 MBytes 306 Mbits/sec 0.036 ms 0/26396 (0%)
[ 5] 4.00-5.00 sec 37.1 MBytes 312 Mbits/sec 0.061 ms 0/26895 (0%)
[ 5] 5.00-6.00 sec 37.2 MBytes 312 Mbits/sec 0.037 ms 0/26909 (0%)
[ 5] 6.00-7.00 sec 37.2 MBytes 312 Mbits/sec 0.079 ms 0/26954 (0%)
[ 5] 7.00-8.00 sec 37.1 MBytes 311 Mbits/sec 0.048 ms 0/26844 (0%)
[ 5] 8.00-9.00 sec 37.2 MBytes 312 Mbits/sec 0.037 ms 0/26930 (0%)
[ 5] 9.00-10.00 sec 37.2 MBytes 312 Mbits/sec 0.045 ms 0/26938 (0%)
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.03 sec 419 MBytes 350 Mbits/sec 0.000 ms 0/303148 (0%) sender
[SUM] 0.0-10.0 sec 5 datagrams received out-of-order
[ 5] 0.00-10.00 sec 367 MBytes 308 Mbits/sec 0.045 ms 0/265906 (0%) receiver
Server:
Accepted connection from CLIENT, port 40876
[ 5] local SERVER port 5201 connected to CLIENT port 47128
[ ID] Interval Transfer Bitrate Total Datagrams
[ 5] 0.00-1.00 sec 41.7 MBytes 350 Mbits/sec 30197
[ 5] 1.00-2.00 sec 41.7 MBytes 350 Mbits/sec 30216
[ 5] 2.00-3.00 sec 41.7 MBytes 350 Mbits/sec 30212
[ 5] 3.00-4.00 sec 41.7 MBytes 350 Mbits/sec 30215
[ 5] 4.00-5.00 sec 41.7 MBytes 350 Mbits/sec 30212
[ 5] 5.00-6.00 sec 41.7 MBytes 350 Mbits/sec 30219
[ 5] 6.00-7.00 sec 41.7 MBytes 350 Mbits/sec 30201
[ 5] 7.00-8.00 sec 41.7 MBytes 350 Mbits/sec 30230
[ 5] 8.00-9.00 sec 41.7 MBytes 350 Mbits/sec 30221
[ 5] 9.00-10.00 sec 41.7 MBytes 350 Mbits/sec 30194
[ 5] 10.00-10.03 sec 1.42 MBytes 351 Mbits/sec 1031
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.03 sec 419 MBytes 350 Mbits/sec 0.000 ms 0/303148 (0%) sender
iPerf3 version on both server and client:
iperf 3.11 (cJSON 1.7.13)
The client has 300Mbit downstream connection to the internet, the server is hosted in a data center.
As the target bandwidth was set to 350M (which is greater than the bandwidth available for the client) I expected dropped packets. Surprisingly, iPerf reports 0% packet loss.
[ 5] 0.00-10.03 sec 419 MBytes 350 Mbits/sec 0.000 ms 0/303148 (0%) sender
[ 5] 0.00-10.00 sec 367 MBytes 308 Mbits/sec 0.045 ms 0/265906 (0%) receiver
Also the amount of data sent / received (419MB / 367MB) differ.
In addition, there is this last interval on the server side which I can not explain.
[ 5] 10.00-10.03 sec 1.42 MBytes 351 Mbits/sec 1031
Apparently, my knowledge is insufficient to explain this behavior. Hoping that someone can give me some insight.
