Today, it is very simple to launch the Jack Audio Connection Kit daemon with realtime
When Jack Audio Connection Kit is installed, it adds specific "limit" to jackuser group, into Pluggable Authentication Modules (pam).
Cf. the /etc/security/limits.conf file.
So the only need is to add the user which must need to launch the Jack Audio Connection Kit daemon with realtime scheduling into the jackuser group:
/usr/sbin/usermod -G jackuser "username"
Then, use the -R option when launching Jack Audio Connection Kit daemon:
jackd -R ...
N.B.: those instructions have been performed (at least) under Fedora 8 scheduling, with a no-root user.
