Re: jackd cpu usage when idle?

Am 08.06.26 um 14:08 schrieb Peter P.:
> * Peter P. <peterparker-97jfqw80gc5Wk0Htik3J/[email protected]> [2026-06-08 12:18]:
>> Hi list,
> as the command that uses cpu keeping the fan on, and whose cpu usage dro=
ps
> when quitting jackd, permitting the fan to stop.
I think it's not necessarily about CPU usage in % that keeps your fan=20
spinning. It's more like jack is constantly waking up the CPU, at least=20
once per buffer. The larger you make the buffer, the less often the CPU=20
has to wake up. Smaller buffers prevent it from sleeping longer, thus=20
increasing the CPU's power usage, even if the "raw CPU usage time" is=20
not really longer. Since transitioning from RUN to SLEEP takes some=20
time, you might just prevent it from sleeping at all.
As far as I understood, jackd keeps the sound card open and sends=20
"zero"-filled buffers, even if no clients are connected. Pipewire might=20
not do that.
Check the "powertop" tool to get an idea of how much time your CPU cores=
=20
spend in which idle state.

	Jannis