[PlanetCCRMA] Planet CCRMA kernel - capaibilities

Mark Knecht markknecht@attbi.com
Sun Dec 29 18:25:02 2002

   Thanks for the info. To follow on, does this method of starting jackd
then extend to Ardour also? As I understand Paul's view, everything
needs to be running with this level of capabilities, not just jack. I
could have this wrong though.


On Sun, 2002-12-29 at 18:04, Fernando Pablo Lopez-Lezcano wrote:
> > low-latency operation as a normal user and how this made possible by
> > using a kernel that has 'capabilities' enabled. He then stated that he
> > thought your PlanetCCRMA kernel did this, and that your jackstart
> > application utilizes capabilities to grant low-latency operation to
> > other Jack apps. I wanted to check that this is true? 
> True.
> > If I run jackstart
> > as a user, and then start other jack applications like Ardour as a user,
> > then do they all get this high level of control over the machine?
> Yep. jackstart grants jackd the capabilities needed to run with realtime
> priviledges and to give its client programs the same capabilities. 
> >    Assuming that it is true, I'm wondering how well the timing of MIDI
> > Sequencers will survive in this environment? I am struggling through
> > some really bad MIDI timing issues as I run Rosegarden as a user along
> > side Ardour and jackstart. 
> I guess the jack part of Rosegarden will benefit. I'm not positive about
> the midi timing. It depends on what timing source Rosegarden uses.
> Rosegarden may need to be setuid root to be able to use high resolution
> timers (if that is what it uses as a timing source) as a normal user. 
> -- Fernando
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