Hi all
I need to test an adhoc wlan connection and use iperf alongside with
other tools like ping, iwconfig, etc.
So that iperf has it's own timeslot I use it in a loop with the -t option.
When I do that the reported speed drops because iperf uses a longer time
after each run.
With this script:
#!/bin/bash
iperf -u -s > /dev/null &
for i in {1..5}; do
iperf -u -c localhost -t 1
done
With "iperf version 2.0.5 (08 Jul 2010) pthreads" I get the following
output.
Please see that the time of the server report is incremented and the
Bandwidth drops because of that.
------------------------------------------------------------
Client connecting to localhost, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 224 KByte (default)
------------------------------------------------------------
[ 3] local 127.0.0.1 port 51709 connected with 127.0.0.1 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0- 1.0 sec 131 KBytes 1.05 Mbits/sec
[ 3] Sent 91 datagrams
[ 3] Server Report:
[ 3] 0.0- 1.0 sec 131 KBytes 1.05 Mbits/sec 0.010 ms 0/ 91 (0%)
------------------------------------------------------------
Client connecting to localhost, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 224 KByte (default)
------------------------------------------------------------
[ 3] local 127.0.0.1 port 35218 connected with 127.0.0.1 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0- 1.0 sec 131 KBytes 1.05 Mbits/sec
[ 3] Sent 91 datagrams
[ 3] Server Report:
[ 3] 0.0- 2.1 sec 131 KBytes 518 Kbits/sec 0.010 ms 0/ 91 (0%)
------------------------------------------------------------
Client connecting to localhost, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 224 KByte (default)
------------------------------------------------------------
[ 3] local 127.0.0.1 port 34262 connected with 127.0.0.1 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0- 1.0 sec 131 KBytes 1.05 Mbits/sec
[ 3] Sent 91 datagrams
[ 3] Server Report:
[ 3] 0.0- 3.1 sec 131 KBytes 343 Kbits/sec 0.008 ms 0/ 91 (0%)
------------------------------------------------------------
Client connecting to localhost, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 224 KByte (default)
------------------------------------------------------------
[ 3] local 127.0.0.1 port 40974 connected with 127.0.0.1 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0- 1.0 sec 131 KBytes 1.05 Mbits/sec
[ 3] Sent 91 datagrams
[ 3] Server Report:
[ 3] 0.0- 4.2 sec 131 KBytes 257 Kbits/sec 0.011 ms 0/ 91 (0%)
------------------------------------------------------------
Client connecting to localhost, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 224 KByte (default)
------------------------------------------------------------
[ 3] local 127.0.0.1 port 56975 connected with 127.0.0.1 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0- 1.0 sec 131 KBytes 1.05 Mbits/sec
[ 3] Sent 91 datagrams
[ 3] Server Report:
[ 3] 0.0- 5.2 sec 131 KBytes 205 Kbits/sec 0.007 ms 0/ 91 (0%)
I this a known bug or a feature? Maybe I should post a bug report?
How can I use iperf in a proper way in a loop?
I'd like to specify the output format (-f) so that I the numbers in the
same range which is much easier to analyse it afterwards.
Atm I'm using the Transfer number of the server report but it's
sometimes in KBytes and sometimes in MBytes which makes postprocessing
cumbersome.
And if the time option of iperf client is changed then I use the wrong
time to calculate the Bandwidth.
Best regards
Ramon
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