I want to use iperf3 to test some QoS settings of a router. Therefore I want to simulate a lone-lasting but low bandwidth connection.*
I tried the following:
$ iperf3 -c MYSERVER -b 100K
Connecting to host MYSERVER, port 5201
[ 4] local 192.168.1.45 port 39042 connected to MYSERVER port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 16.0 KBytes 131 Kbits/sec 0 18.7 KBytes
[ 4] 1.00-2.00 sec 37.4 KBytes 306 Kbits/sec 0 30.7 KBytes
[ 4] 2.00-3.00 sec 0.00 Bytes 0.00 bits/sec 0 30.7 KBytes
[ 4] 3.00-4.00 sec 0.00 Bytes 0.00 bits/sec 0 30.7 KBytes
[ 4] 4.00-5.00 sec 64.1 KBytes 525 Kbits/sec 0 33.4 KBytes
[ 4] 5.00-6.00 sec 0.00 Bytes 0.00 bits/sec 0 33.4 KBytes
[ 4] 6.00-7.00 sec 0.00 Bytes 0.00 bits/sec 0 33.4 KBytes
[ 4] 7.00-8.00 sec 0.00 Bytes 0.00 bits/sec 0 33.4 KBytes
[ 4] 8.00-9.00 sec 0.00 Bytes 0.00 bits/sec 0 33.4 KBytes
[ 4] 9.00-10.00 sec 74.8 KBytes 613 Kbits/sec 0 33.4 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 192 KBytes 158 Kbits/sec 0 sender
[ 4] 0.00-10.00 sec 176 KBytes 144 Kbits/sec receiver
So, somehow the bandwidth limit is not applied.
It gets worse if I try localhost
$ iperf3 -c localhost -b 100K
Connecting to host localhost, port 5201
[ 4] local 127.0.0.1 port 52222 connected to 127.0.0.1 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 128 KBytes 1.05 Mbits/sec 0 639 KBytes
[ 4] 1.00-2.00 sec 0.00 Bytes 0.00 bits/sec 0 639 KBytes
[ 4] 2.00-3.00 sec 0.00 Bytes 0.00 bits/sec 0 639 KBytes
[ 4] 3.00-4.00 sec 0.00 Bytes 0.00 bits/sec 0 639 KBytes
[ 4] 4.00-5.00 sec 0.00 Bytes 0.00 bits/sec 0 639 KBytes
[ 4] 5.00-6.00 sec 0.00 Bytes 0.00 bits/sec 0 639 KBytes
[ 4] 6.00-7.00 sec 0.00 Bytes 0.00 bits/sec 0 639 KBytes
[ 4] 7.00-8.00 sec 0.00 Bytes 0.00 bits/sec 0 639 KBytes
[ 4] 8.00-9.00 sec 0.00 Bytes 0.00 bits/sec 0 639 KBytes
[ 4] 9.00-10.00 sec 0.00 Bytes 0.00 bits/sec 0 639 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 128 KBytes 105 Kbits/sec 0 sender
[ 4] 0.00-10.00 sec 128 KBytes 105 Kbits/sec receiver
iperf Done.
Does anyone have an idea what I do wrong?
I tried iperf3 versions 3.0.7 and 3.0.12
*In the end I want to ensure that some low-bandwidth connections are preferred over anything else in the network.
