[Jack-Devel] How do I eliminate pops between alsa_in and alsa loopback?

[crocket]

I made ALSA applications output audio to jack by applying instructions on
https://alsa.opensrc.org/Jack_and_Loopback_device_as_Alsa-to-Jack_bridge

# Gentoo Linux aarch64 on Raspberry Pi 3 B+

jackd -P 90 -d alsa -d speakers -p 512 -n 3 -P -r 48000
jack_netsource -H 192.168.30.2 -o 0 -i 2 -O 0 -I 0 -n 3 -N guardian

# Gentoo Linux amd64 on my desktop computer

jackd -P 90 -d netone -p 512 -n 3 -r 48000
alsa_out -j headphones -d headphones -c 2 -p 512 -n 3 -q 3
alsa_in -j cloop -d cloop -c 2 -p 1024 -n 2 -q 3

jackd, jack_netsource, alsa_in, and alsa_out belong to audio cgroup which
allocates 95% of CPU time to its group members.

While youtube videos are played in vivaldi web browser, chrome web browser,
and firefox web browser, I occasionally hear audible pops. It seems all
pops come from `alsa_in`. I also tried alsa_in -p 1024 -n 3 -q 2|3|4, but
it doesn't eliminate pops.

Here's a part of ~/.asoundrc on my desktop computer.

pcm.loophw00 {
  type hw
  card Loopback
  device 0
  subdevice 0
  format S16_LE
  rate 48000
  channels 2
}

pcm.lmix {
  type dmix
  ipc_key 219347
  slave {
    pcm "loophw00"
    period_time 0
    period_size 512
    periods 4
    format S16_LE
    rate 48000
    channels 2
  }
  bindings {
    0 0
    1 1
  }
}

pcm.cloop {
  type hw
  card Loopback
  device 1
  subdevice 0
  format S16_LE
  rate 48000
  channels 2
}

pcm.!default {
  type plug
  slave {
    pcm "lmix"
    format S16_LE
    channels 2
    rate 48000
  }
  rate_converter "samplerate_best"
}

Is it impossible to eliminate pops from alsa_in running on cloop which is
just alsa loopback?
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