On 10/29/07, Chuckk Hubbard <badmuthahubbard@gmail.com> wrote:
> Update: I just discovered that running jackd -R -P 70 -dalsa -P -p256 -n2
> -r44100 as ROOT doesn't even set priority 70. jackd then runs as a root
> process with priority 20, according to both chrt and top.
> Apparently my system is not able to run anything higher than 20 priority;
> does this mean my kernel is misconfigured, or might it be something else?

jackd is a multithreaded process, you can't just look at the priority
of the main thread, you have to check all of them. It should have
some SCHED_FIFO threads and some SCHED_NORMAL threads.

Interesting, I'll have to keep reading until I find out how to do that.
But is it normal, then, that chrt -p 70 `pidof "jackd"` would set rtprio 70 but jackd -R -P 70 etc. wouldn't?
Which is to say, if chrt can set the main thread priority, why not the -P flag?

-Chuckk