Adding to comment 29, I tried generating lots of bidirectional TCP and
UDP traffic with `iperf3` while running some `stress-ng --matrix 0 -t
16m --verify --verbose`

But all I was doing with `sudo cpufreq-set --governor powersave` was
flipping the **governor** between `performance`, `powersave` and
`userspace` every few seconds. Anyone know how to change the actual CPU
frequency itself? If I understand the original reporter’s comprehensive
notes, the hypothesis is CPU frequency transitions. I also tried `sudo
cpufreq-set --min <value>` and couldn’t make any difference to the
actual frequency according to `lscpu`.

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https://bugs.launchpad.net/bugs/2133877

Title:
  Complete network hang on Raspberry Pi 5 with kernel 6.17 under load -
  possibly related to CPU frequency scaling

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