Since the "original" size of /dev/shm was too small for jack2, I've added
this
to /etc/fstab (ripped from somewhere on the net):
none /dev/shm tmpfs defaults,size=128M 0 0
Hmm... if I remove this line, the amount is ~464MB, so it was not needed from the start.
Doesn't change anything though...
Regards
/Robert