[Rpm] Latency tests in comparison, Ookla, dslreports, flent
Sebastian Moeller
moeller0 at gmx.de
Sat Jun 18 10:13:44 EDT 2022
So here are results from the same Nokia 6.2 Android11 device, once over LTE (with the ISP's shaper set to apparently 25/10) and once over WiFI (5GHz) where the actual limit comes from SQM set to 105/36 (on a VDSL2-link with 116/37 sync). Both results are less than perfect, but over LTE the bloat is quite painful (due to the lack of a time resolved display it is hard to estimate how much of the High result is just happening during the initial peak of the transfer, where it seems that the shaper kicks in with a delay, or potentially it might just allow bursts).
Looking at the time resolved results for LTE on DSL reports (http://www.dslreports.com/speedtest/71047363) seems to indicate that it is not only the initial peak:
Download (LTE):
Download (WiFi):
Upload (LTE):
Upload (WiFi):
(I clearly have some issues with repeated upload delay up to 600-800ms in this test). A flent test over ethernet however shows RTT maxima (of seprate RTT measurement flows so not intra-dataflow RTTs, max tcp_rtt stays below 50ms for all data flows, but that is already smoothed data IIRC):
Ping (ms)::ICMP : 28.54 28.40 36.00 ms 1397
Ping (ms)::UDP 0 (CS0) : 28.50 28.33 35.21 ms 1628
Ping (ms)::UDP 1 (CS1) : 28.11 28.22 34.73 ms 1628
Ping (ms)::UDP 2 (CS2) : 26.49 26.26 34.93 ms 1628
Ping (ms)::UDP 3 (CS3) : 26.46 26.32 34.05 ms 1628
Ping (ms)::UDP 4 (CS4) : 26.40 26.21 34.65 ms 1628
Ping (ms)::UDP 5 (CS5) : 26.47 26.28 35.08 ms 1628
Ping (ms)::UDP 6 (CS6) : 29.32 29.26 37.26 ms 1628
Ping (ms)::UDP 7 (CS7) : 28.90 28.81 35.97 ms 1628
TCP download avg : 11.90 N/A N/A Mbits/s 1628
TCP download sum : 95.22 N/A N/A Mbits/s 1628
TCP download::0 (CS0) : 11.95 12.30 15.07 Mbits/s 1628
TCP download::1 (CS1) : 11.72 12.23 13.94 Mbits/s 1628
TCP download::2 (CS2) : 11.92 12.31 14.31 Mbits/s 1628
TCP download::3 (CS3) : 11.84 12.29 14.00 Mbits/s 1628
TCP download::4 (CS4) : 11.83 12.30 14.12 Mbits/s 1628
TCP download::5 (CS5) : 12.05 12.31 15.01 Mbits/s 1628
TCP download::6 (CS6) : 11.93 12.30 14.96 Mbits/s 1628
TCP download::7 (CS7) : 11.98 12.32 14.47 Mbits/s 1628
TCP totals : 125.83 N/A N/A Mbits/s 1628
TCP upload avg : 3.83 N/A N/A Mbits/s 1628
TCP upload sum : 30.61 N/A N/A Mbits/s 1628
TCP upload::0 (CS0) : 4.27 4.31 7.17 Mbits/s 1628
TCP upload::0 (CS0)::tcp_cwnd : 13.37 13.00 20.00 955
TCP upload::0 (CS0)::tcp_delivery_rate : 4.12 4.23 5.57 955
TCP upload::0 (CS0)::tcp_pacing_rate : 5.31 5.45 7.65 955
TCP upload::0 (CS0)::tcp_rtt : 35.24 34.45 48.87 955
TCP upload::0 (CS0)::tcp_rtt_var : 2.36 1.98 11.09 955
TCP upload::1 (CS1) : 1.74 1.76 2.70 Mbits/s 1628
TCP upload::1 (CS1)::tcp_cwnd : 8.18 8.00 13.00 951
TCP upload::1 (CS1)::tcp_delivery_rate : 1.65 1.72 2.95 951
TCP upload::1 (CS1)::tcp_pacing_rate : 2.21 2.29 4.39 951
TCP upload::1 (CS1)::tcp_rtt : 52.63 51.92 73.08 949
TCP upload::1 (CS1)::tcp_rtt_var : 6.30 6.00 16.16 949
TCP upload::2 (CS2) : 4.24 4.31 5.30 Mbits/s 1628
TCP upload::2 (CS2)::tcp_cwnd : 13.10 13.00 18.00 948
TCP upload::2 (CS2)::tcp_delivery_rate : 4.11 4.22 5.19 947
TCP upload::2 (CS2)::tcp_pacing_rate : 5.25 5.42 7.13 948
TCP upload::2 (CS2)::tcp_rtt : 34.81 34.56 46.65 946
TCP upload::2 (CS2)::tcp_rtt_var : 2.43 2.11 10.81 946
TCP upload::3 (CS3) : 4.27 4.38 5.19 Mbits/s 1628
TCP upload::3 (CS3)::tcp_cwnd : 13.29 13.00 18.00 949
TCP upload::3 (CS3)::tcp_delivery_rate : 4.13 4.25 5.08 948
TCP upload::3 (CS3)::tcp_pacing_rate : 5.30 5.52 6.82 949
TCP upload::3 (CS3)::tcp_rtt : 34.99 34.73 45.70 947
TCP upload::3 (CS3)::tcp_rtt_var : 2.39 2.03 11.09 947
TCP upload::4 (CS4) : 4.26 4.37 5.23 Mbits/s 1628
TCP upload::4 (CS4)::tcp_cwnd : 13.33 13.00 18.00 950
TCP upload::4 (CS4)::tcp_delivery_rate : 4.10 4.23 5.05 949
TCP upload::4 (CS4)::tcp_pacing_rate : 5.27 5.47 6.79 950
TCP upload::4 (CS4)::tcp_rtt : 35.29 34.94 46.76 947
TCP upload::4 (CS4)::tcp_rtt_var : 2.43 2.11 11.32 947
TCP upload::5 (CS5) : 4.25 4.32 5.51 Mbits/s 1628
TCP upload::5 (CS5)::tcp_cwnd : 14.06 14.00 19.00 948
TCP upload::5 (CS5)::tcp_delivery_rate : 4.10 4.24 5.24 947
TCP upload::5 (CS5)::tcp_pacing_rate : 5.23 5.42 6.94 948
TCP upload::5 (CS5)::tcp_rtt : 37.51 36.82 47.57 943
TCP upload::5 (CS5)::tcp_rtt_var : 2.27 1.96 9.95 943
TCP upload::6 (CS6) : 3.81 3.87 5.01 Mbits/s 1628
TCP upload::6 (CS6)::tcp_cwnd : 12.08 12.00 17.52 949
TCP upload::6 (CS6)::tcp_delivery_rate : 3.68 3.80 4.96 948
TCP upload::6 (CS6)::tcp_pacing_rate : 4.70 4.88 6.50 949
TCP upload::6 (CS6)::tcp_rtt : 35.90 35.32 48.65 946
TCP upload::6 (CS6)::tcp_rtt_var : 2.67 2.33 9.81 946
TCP upload::7 (CS7) : 3.77 3.85 4.85 Mbits/s 1628
TCP upload::7 (CS7)::tcp_cwnd : 11.91 12.00 17.00 950
TCP upload::7 (CS7)::tcp_delivery_rate : 3.62 3.77 4.83 949
TCP upload::7 (CS7)::tcp_pacing_rate : 4.63 4.83 6.34 949
TCP upload::7 (CS7)::tcp_rtt : 35.91 35.15 47.73 947
TCP upload::7 (CS7)::tcp_rtt_var : 2.56 2.31 9.04 947
cpu_stats_root at 192.168.42.1::load : 0.37 0.35 0.83 1214
Now, this clearly is not apples to apples, since flent does not run on my phone and this test was over ethernet, but I think it demonstrates that the upload latency spikes over WiFi are not my ISP's responsibility, but something in my WiFi set-up that needs fixing.
I am living next door to a CO and "my" LTE antenna is around 20-30m away (distance phone to antenna element).
Might I propose to add time resolved latency plots to the two time resolved speed lines in the detailed results view, please?
Regards
Sebastian
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