[Cake] goresponsiveness over slow 5g

[Dave Taht]

Pulled down the latest
https://github.com/network-quality/goresponsiveness and built it with
go.1.18.

Some notes in #s. Tests were performed via linux kernel

Linux milliways 5.4.0-80-lowlatency #90-Ubuntu SMP PREEMPT Fri Jul 9
23:56:54 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

over tethered wifi to a oneplus nord n105g running oxygen OS
11.05BE.86AA, linux kernel 4.19.125perf+

# No cake on the wifi:

./goresponsiveness --config mensura.cdn-apple.com --port 443 --path
/api/v1/gm/config
04-06-2022 15:52:32 UTC Go Responsiveness to mensura.cdn-apple.com:443...
Download:   7.594 Mbps (  0.949 MBps), using 28 parallel connections.

# Really should cap this. 28 flows at this rate is certain to end in tears.

Upload:     1.906 Mbps (  0.238 MBps), using 12 parallel connections.
Total RTTs measured: 5
RPM:   170


# cake 6mbit/3mbit

davet at milliways:~/git/goresponsiveness$ ./goresponsiveness --config
mensura.cdn-apple.com --port 443 --path /api/v1/gm/config
04-06-2022 15:53:57 UTC Go Responsiveness to mensura.cdn-apple.com:443...
Download:   8.343 Mbps (  1.043 MBps), using 12 parallel connections.
Upload:     2.500 Mbps (  0.312 MBps), using 12 parallel connections.
Total RTTs measured: 5
RPM:   182

./goresponsiveness --config mensura.cdn-apple.com --port 443 --path
/api/v1/gm/config
04-06-2022 15:55:11 UTC Go Responsiveness to mensura.cdn-apple.com:443...
Download:   6.750 Mbps (  0.844 MBps), using 12 parallel connections.
Upload:     2.000 Mbps (  0.250 MBps), using 36 parallel connections.

# 36??? flows at this rate is utterly certain to end in tears.

Total RTTs measured: 5
RPM:   154

# cake output after these testss

                  Tin 0
  thresh          3Mbit
  target          6.1ms
  interval      101.1ms
  pk_delay       14.7ms
  av_delay        6.4ms
  sp_delay          8us
  backlog            0b
  pkts            15275
  bytes        10576809
  way_inds          252
  way_miss          191
  way_cols            0
  drops            2807
  marks               0
  ack_drop            0
  sp_flows           14
  bk_flows            1
  un_flows            0
  max_len          6470
  quantum           300

# RFC3168 style ECN IS enabled on the mensura server. Yay!
# If I enable it on my client

./goresponsiveness --config mensura.cdn-apple.com --port 443 --path
/api/v1/gm/config
04-06-2022 16:03:47 UTC Go Responsiveness to mensura.cdn-apple.com:443...
Error: Saturation could not be completed in time and no provisional
rates could be accessed. Test failed.

                 Tin 0
  thresh          6Mbit
  target          5.0ms
  interval      100.0ms
  pk_delay       23.3ms
  av_delay       13.6ms
  sp_delay         16us
  backlog            0b
  pkts            40856
  bytes        34440011
  way_inds          774
  way_miss          402
  way_cols            0
  drops             956
  marks            8907
# mark away!
  ack_drop            0
  sp_flows           63
  bk_flows            1
  un_flows            0
  max_len          1442
  quantum           300

# with ecn, repeated tests almost always timeout. It would be useful
if they displayed their attempted params...

./goresponsiveness --config mensura.cdn-apple.com --port 443 --path
/api/v1/gm/config
04-06-2022 16:10:30 UTC Go Responsiveness to mensura.cdn-apple.com:443...
Download:   4.562 Mbps (  0.570 MBps), using 12 parallel connections.
Upload:     2.594 Mbps (  0.324 MBps), using 44 parallel connections.

# this inversion between lower bandwdith and higher connects needs to
get looked at.

Total RTTs measured: 5

# perhaps a goal of trying to measure for more RTTs than five would help.

-- 
I tried to build a better future, a few times:
https://wayforward.archive.org/?site=https%3A%2F%2Fwww.icei.org

Dave Täht CEO, TekLibre, LLC