Just a quick shoutout to Will Hawkins goresponsiveness effort
(h++ps://github.com/network-quality/goresponsiveness: open source go
implementation along the lines of the RPM IETF responsiveness draft
(h++ps://github.com/network-quality/draft-ietf-ippm-responsiveness).
The goal I think is a quick latency under working conditions/latency under load
for the rest of us. I think the draft likely will get a last call soon, so
whoever wants to add something to the spec or just wants to comment, now would
be a good time:
goresponsiveness is currently acquiring a few nice features, like the ability
to compare the latency between idle and working conditions, run both saturating
loads concurrently, and to report the sub results for the "self" probes
(measuring latency within the load generating connection/flow) and the
"foreign" probes (measuring latency outside of the load generating flows)
bash-3.2$ ./networkQuality --relative-rpm --rpm.parallel --config
mensura.cdn-apple.com --port 443 --path /api/v1/gm/config --rpm.timeout 120
--extended-stats --rpm.mnp 32 --logger-filename
go_networkQuality_20231228_223707 --detailed
01-08-2024 19:37:07 UTC Go Responsiveness to mensura.cdn-apple.com:443...
Baseline RPM: 2813 (P90)
Baseline RPM: 3888 (Single-Sided 5% Trimmed Mean)
Results:
========
Download:
Throughput: 80.367 Mbps (10.046 MBps), using 13 parallel connections.
Extended Statistics:
Maximum Segment Size: 1208
Total Bytes Retransmitted: 2860
Retransmission Ratio: 0.25%
Total Bytes Reordered: 140968234
Average RTT: 34.30769230769231
RPM: 264 (P90)
RPM: 509 (Single-Sided 5% Trimmed Mean)
========
Upload:
Throughput: 30.124 Mbps (3.766 MBps), using 9 parallel connections.
Extended Statistics:
Maximum Segment Size: 1208
Total Bytes Retransmitted: 466855
Retransmission Ratio: 0.95%
Total Bytes Reordered: 700
Average RTT: 37
RPM: 676 (P90)
RPM: 2536 (Single-Sided 5% Trimmed Mean)
========
Final RPM Calculation stats:
Total Self Probes: 933
Total Foreign Probes: 2799
Trimmed Self Probes Count: 46
Trimmed Foreign Probes Count: 139
P90 Self RTT: 0.379444841
P90 Foreign RTT: 0.031294024999999996
Trimmed Mean Self RTT: 0.035124
Trimmed Mean Foreign RTT: 0.017979
Final RPM: 292 (P90)
Final RPM: 2260 (Single-Sided 5% Trimmed Mean)
Final RPM (Self Only): 158 (P90)
Final RPM (Self Only): 1708 (Single-Sided 5% Trimmed Mean)
Final RPM (Foreign Only): 1917 (P90)
Final RPM (Foreign Only): 3337 (Single-Sided 5% Trimmed Mean)
Working Conditions RPM Effect: 162% (P90)
Working Conditions RPM Effect: 53% (Single-Sided 5% Trimmed Mean)
The beauty of the self and foreign reports is that here we can see that my
cake'd upstream does a decent job to preserve foreign responsiveness while in
the self responsiveness we see how TCP self-congests like there is no
tomorrow... Please ignore the download direction, this is over a 100 Mbps USB
ethernet dongle and my true download shaper is set to 105 Mbps, so this is
mostly the bad USB dongle in action...
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