I have tested with jackd -P 90 -d alsa -p 256 -n 2 jack_netsource -n 3 -H xxxx jackd -P 90 -d netone -n 3 zita-a2j -p 128 -n 3 zita-j2a -p 128 -n 3 and zita-j2a -p 256 -n 3 jackminimix Every process in the list is in audio cgroup that allocates 95% of CPU time to realtime threads to members. Did I configure -p improperly?