#252 Jitter update needs to reset and go to zero on no packet events

[Robert McMahon]

While trying to quantify some of the issues I’m seeing with the new firewall rules, I noticed that when iperf stops receiving any UDP traffic, the Jitter field continues to show the results from the last interval that did have traffic. I’m not entirely sure the definition of “jitter” but it looks a little odd to me. I think I would expect any interval that received no packets to be showing zeroes for all fields.

# iperf -s -p 40000 -i 2 -u
------------------------------------------------------------
Server listening on UDP port 40000
UDP buffer size:  208 KByte (default)
------------------------------------------------------------
[  1] local 10.19.86.250 port 40000 connected with 10.75.220.139 port 39817
[ ID] Interval       Transfer     Bandwidth        Jitter   Lost/Total Datagrams
[  1] 0.00-2.00 sec  4.31 KBytes  17.6 Kbits/sec  65.948 ms 0/3 (0%)
[  1] 0.00-2.00 sec  1 datagrams received out-of-order
[  1] 2.00-4.00 sec  0.000 Bytes  0.000 bits/sec  65.948 ms 0/0 (-nan%)
[  1] 4.00-6.00 sec  0.000 Bytes  0.000 bits/sec  65.948 ms 0/0 (-nan%)
[  1] 6.00-8.00 sec  0.000 Bytes  0.000 bits/sec  65.948 ms 0/0 (-nan%)
[  1] 8.00-10.00 sec  0.000 Bytes  0.000 bits/sec  65.948 ms 0/0 (-nan%)

[Robert McMahon]

Fix is here