On Linux SCHED_FIFO and SCHED_RR

Question

I\'m writing a a very small daemon that must remain responsive even when a system is under severe stress. I\'m looking at the differences between SCHED_FIFO and SCHED_RR in

Answer 1

The infamous pchdtvr program, which captures digital TV signals, uses SCHED_FIFO to make sure that the TV packets are written to disk no matter what. It can capture 4 shows at once while playing Doom on an old computer.

The program is infamous because it was released under GPL and the author tried to revoke the GPL retroactively. This act provoked a minor firestorm. Anyway, you can find a recent version to study at http://frequal.com/pmn/pchdtvr.html.