[linux-audio-dev] [Slightly OT] How to access "real-time" capabilities

[Jack O'Quin]

asbjs at stud.ntnu.no (Asbjørn Sæbø) writes:

> * Will an ordinary program, run as root, take advantage of the real time 
>   capabilities of the kernel?

No.

> * Will an ordinary program, run as a user that is a member of the 
>   "audio" group on f.i. Agnula, take advantage of the real-time capabilities?

No.

> * If given a real-time kernel, what else is necessary to take advantage 
>   of its capabilities?

Your realtime thread needs to use one of the POSIX realtime scheduling
options: SCHED_FIFO or SCHED_RR.  For best results, only do this for
the code that actually *needs* precise timing.

> * How does normal priorities (nice, renice) play together with the 
>   real-time kernel?

They run at a lower priority than SCHED_FIFO or SCHED_RR threads.
-- 
  joq