high cpu usage with speaker forwarding

[totaam]

Reported on IRC about a CentOS 8 docker container.
stracing that platform-python floods the terminal with

recvmsg(7, 0x7ffd450caae0, 0)           = -1 EAGAIN (Resource temporarily unavailable)

it's maybe this in lsof:

xpra    3749   272144    7u     sock    0,8      0t0 204146195 protocol: UNIX

Running with --no-speaker fixes the issue.
Perhaps the audio subprocess uses non-blocking reads on the pipes?
But this shows up as sock..
Needs checking.

[aki-k]

the strace log was generated of about a 5 second period.

xpra_pulseaudio_problem.txt

[totaam]

We switched to removesilence in #3709.
I don't see anything here caused by xpra, this seems to be the result of the gstreamer pipeline.
I can copy the pipeline used:

xpra info | grep client.sound.speaker.pipeline

Then run it via gst-launch-1.0 after replacing the appsink element with a fakesink and the resulting process shows the same behaviour.

So, closing as not-our-problem.