[Make-wifi-fast] Network telemetry and non-parametric distributions

Bob McMahon bob.mcmahon at broadcom.com
Mon Jan 3 19:23:52 EST 2022

Hi All,

Happy New Year! My apologies up front if this email is not of interest
and hence spam to you.

I was hoping to get some technical feedback from industry networking and
queuing experts with respect to latency fault detection and forwarding path
decisions. Iperf 2 <https://sourceforge.net/projects/iperf2/> flows code
produces dendrograms (ward clustering) with respect to e2e latencies.
(Latencies can be video frames, write to reads, packets, etc.) The metric
used to populate the distance matrices comes per the Kolmogorov Smirnov
<https://en.wikipedia.org/wiki/Kolmogorov%E2%80%93Smirnov_test> two sample
test which supports comparing non-parametric distributions.

WiFi 6 plans to use MU transmissions to reduce latency as one TXOP or
scheduled trigger can TX multiple AP/STA packets, i.e. kinda a form of
multicast (just doesn't use L2 MCAST DAs but rather does it in the RF

I'm wondering about realtime detection of "latency timing violations," and
possibly using ML to identify better low latency path trees (LLPT)
analogous to IP multicast RPT and SPT. The idea is to cluster the graphs in
a way that packets get probabilistically bunched into microbursts per the
final AP's MU groups (since it's assumed the last hop is WiFi.)

Does this seem technically reasonable and, if so, is there a
reasonable return on the engineering? I'd like to prototype it with iperf
2, python (pyflows) and on some test rigs but it's a lot of work and I
don't want to take on that work if the return on engineering (ROE) is near

Thanks in advance for your thoughts and opinions,

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