Hello, all!
I'm having some trouble interpreting some strange Iperf UDP results I'm
receiving. If I use the following code on a wireless link (whose endpoints
are only about five feet apart):
Server: iperf -s -u -l 1472 -i 1
Client: iperf -c <IP> -u -l 1472 -b 50m -t 60
I get some strange results from my per-second feedback.
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 0.0- 1.0 sec 5.40 MBytes 45.3 Mbits/sec 0.260 ms 37/ 3887
(0.95%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 1.0- 2.0 sec 4.75 MBytes 39.9 Mbits/sec 0.253 ms 328/ 3715 (8.8%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 2.0- 3.0 sec 6.44 MBytes 54.1 Mbits/sec 0.357 ms 516/ 5107 (10%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 3.0- 4.0 sec 5.39 MBytes 45.2 Mbits/sec 0.239 ms 476/ 4315 (11%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 4.0- 5.0 sec 5.73 MBytes 48.1 Mbits/sec 0.239 ms 199/ 4281 (4.6%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 5.0- 6.0 sec 5.86 MBytes 49.2 Mbits/sec 0.291 ms 62/ 4236 (1.5%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 6.0- 7.0 sec 5.91 MBytes 49.6 Mbits/sec 0.251 ms 69/ 4277 (1.6%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 7.0- 8.0 sec 5.93 MBytes 49.7 Mbits/sec 0.258 ms 25/ 4248
(0.59%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 8.0- 9.0 sec 5.62 MBytes 47.2 Mbits/sec 0.248 ms 145/ 4151 (3.5%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 9.0-10.0 sec 5.57 MBytes 46.8 Mbits/sec 0.239 ms 285/ 4255 (6.7%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 10.0-11.0 sec 5.73 MBytes 48.1 Mbits/sec 0.244 ms 219/ 4300 (5.1%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 11.0-12.0 sec 5.92 MBytes 49.6 Mbits/sec 0.250 ms 37/ 4252
(0.87%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 12.0-13.0 sec 5.46 MBytes 45.8 Mbits/sec 0.248 ms 371/ 4260 (8.7%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 13.0-14.0 sec 5.35 MBytes 44.8 Mbits/sec 0.240 ms 360/ 4168 (8.6%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 14.0-15.0 sec 5.50 MBytes 46.2 Mbits/sec 0.248 ms 351/ 4271 (8.2%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 15.0-16.0 sec 5.31 MBytes 44.5 Mbits/sec 0.251 ms 406/ 4186 (9.7%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 16.0-17.0 sec 5.59 MBytes 46.9 Mbits/sec 0.249 ms 346/ 4326 (8%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 17.0-18.0 sec 5.52 MBytes 46.3 Mbits/sec 0.245 ms 227/ 4159 (5.5%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 18.0-19.0 sec 5.66 MBytes 47.4 Mbits/sec 0.248 ms 214/ 4243 (5%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 19.0-20.0 sec 5.83 MBytes 48.9 Mbits/sec 0.261 ms 204/ 4357 (4.7%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 20.0-21.0 sec 5.27 MBytes 44.2 Mbits/sec 0.249 ms 385/ 4142 (9.3%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 21.0-22.0 sec 6.02 MBytes 50.5 Mbits/sec 0.248 ms 26/ 4311 (0.6%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 22.0-23.0 sec 5.85 MBytes 49.1 Mbits/sec 0.281 ms 16/ 4186
(0.38%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 23.0-24.0 sec 6.03 MBytes 50.6 Mbits/sec 0.249 ms 22/ 4321
(0.51%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 24.0-25.0 sec 5.76 MBytes 48.3 Mbits/sec 0.250 ms 43/ 4147 (1%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 25.0-26.0 sec 6.10 MBytes 51.2 Mbits/sec 0.251 ms 17/ 4364
(0.39%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 26.0-27.0 sec 5.45 MBytes 45.7 Mbits/sec 0.256 ms 368/ 4252 (8.7%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 27.0-28.0 sec 5.54 MBytes 46.5 Mbits/sec 0.246 ms 191/ 4137 (4.6%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 28.0-29.0 sec 6.01 MBytes 50.4 Mbits/sec 0.249 ms 33/ 4312
(0.77%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 29.0-30.0 sec 5.48 MBytes 46.0 Mbits/sec 0.251 ms 283/ 4187 (6.8%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 30.0-31.0 sec 5.50 MBytes 46.2 Mbits/sec 0.250 ms 402/ 4323 (9.3%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 31.0-32.0 sec 3.86 MBytes 32.4 Mbits/sec 0.738 ms 1254/ 4003 (31%)
[ 5] 31.0-32.0 sec 2 datagrams received out-of-order
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 32.0-33.0 sec 1.88 MBytes 15.8 Mbits/sec 1.305 ms 2603/ 3945 (66%)
[ 5] 32.0-33.0 sec 2 datagrams received out-of-order
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 33.0-34.0 sec 1.84 MBytes 15.4 Mbits/sec 0.364 ms 3109/ 4420 (70%)
[ 5] 33.0-34.0 sec 2 datagrams received out-of-order
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 34.0-35.0 sec 2.14 MBytes 18.0 Mbits/sec 1.116 ms 2800/ 4326 (65%)
[ 5] 34.0-35.0 sec 5 datagrams received out-of-order
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 35.0-36.0 sec 1.94 MBytes 16.3 Mbits/sec 0.252 ms 2936/ 4321 (68%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 36.0-37.0 sec 2.14 MBytes 18.0 Mbits/sec 0.392 ms 2700/ 4227 (64%)
[ 5] 36.0-37.0 sec 3 datagrams received out-of-order
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 37.0-38.0 sec 2.60 MBytes 21.8 Mbits/sec 0.247 ms 2391/ 4246 (56%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 38.0-39.0 sec 2.04 MBytes 17.1 Mbits/sec 0.334 ms 2733/ 4186 (65%)
[ 5] 38.0-39.0 sec 5 datagrams received out-of-order
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 39.0-40.0 sec 2.12 MBytes 17.8 Mbits/sec 1.326 ms 2490/ 3999 (62%)
[ 5] 39.0-40.0 sec 3 datagrams received out-of-order
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 40.0-41.0 sec 1.01 MBytes 8.49 Mbits/sec 1.335 ms 3544/ 4265 (83%)
[ 5] 40.0-41.0 sec 8 datagrams received out-of-order
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 41.0-42.0 sec 2.51 MBytes 21.1 Mbits/sec 0.759 ms 2535/ 4323 (59%)
[ 5] 41.0-42.0 sec 16 datagrams received out-of-order
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 42.0-43.0 sec 1.72 MBytes 14.4 Mbits/sec 0.244 ms 3084/ 4307 (72%)
[ 5] 42.0-43.0 sec 5 datagrams received out-of-order
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 43.0-44.0 sec 2.09 MBytes 17.6 Mbits/sec 0.307 ms 2808/ 4299 (65%)
[ 5] 43.0-44.0 sec 3 datagrams received out-of-order
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 44.0-45.0 sec 3.10 MBytes 26.0 Mbits/sec 0.253 ms 1672/ 3880 (43%)
[ 5] 44.0-45.0 sec 1 datagrams received out-of-order
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 45.0-46.0 sec 6.33 MBytes 53.1 Mbits/sec 0.249 ms 289/ 4796 (6%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 46.0-47.0 sec 6.10 MBytes 51.1 Mbits/sec 0.249 ms 0/ 4342 (0%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 47.0-48.0 sec 5.62 MBytes 47.2 Mbits/sec 0.293 ms 10/ 4016
(0.25%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 48.0-49.0 sec 5.93 MBytes 49.7 Mbits/sec 0.250 ms 148/ 4372 (3.4%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 49.0-50.0 sec 5.77 MBytes 48.4 Mbits/sec 0.256 ms 194/ 4303 (4.5%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 50.0-51.0 sec 5.71 MBytes 47.9 Mbits/sec 0.258 ms 109/ 4178 (2.6%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 51.0-52.0 sec 5.37 MBytes 45.0 Mbits/sec 0.248 ms 395/ 4218 (9.4%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 52.0-53.0 sec 5.66 MBytes 47.5 Mbits/sec 0.263 ms 263/ 4298 (6.1%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 53.0-54.0 sec 5.47 MBytes 45.9 Mbits/sec 0.252 ms 281/ 4180 (6.7%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 54.0-55.0 sec 5.63 MBytes 47.2 Mbits/sec 0.249 ms 193/ 4202 (4.6%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 55.0-56.0 sec 5.65 MBytes 47.4 Mbits/sec 0.258 ms 223/ 4249 (5.2%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 56.0-57.0 sec 5.38 MBytes 45.1 Mbits/sec 0.271 ms 402/ 4233 (9.5%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 57.0-58.0 sec 5.60 MBytes 47.0 Mbits/sec 0.272 ms 200/ 4191 (4.8%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 58.0-59.0 sec 5.74 MBytes 48.2 Mbits/sec 0.247 ms 200/ 4290 (4.7%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 59.0-60.0 sec 5.34 MBytes 44.8 Mbits/sec 0.248 ms 388/ 4189 (9.3%)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
[ 5] 0.0-60.2 sec 293 MBytes 40.8 Mbits/sec 0.298 ms 46633/255320
(18%)
[ 5] 0.0-60.2 sec 55 datagrams received out-of-order
Why is there such an immense variation in packet loss (throughput)? From
0% packet loss to 83% packet loss, how do I choose a number to reliably
depict the actual performance of this network? Interestingly, I ran this
test several other times, getting runs in which all the per-second reports
had about 5% packet loss, and getting at least one 60-second run in which
almost all the reports were 50% to 90% packet loss.
I'm not sure what to make of this - is it an Iperf issue or a network
problem? If it's a network problem, where does the issue lie? - surely not
in the wireless signal since the endpoints are so close in proximity.
Where are the packets being lost?
Thanks,
Charles McIntosh
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