I have a process that sets it scheduler to SCHED_FIFO and it priority to 99. However, ps shows a priority significant lower than 99. In fact it changes from time to time and goes down to 0 sometimes. Isn't this priority supposed to be static? Michael -- Michael Meskes | Go SF 49ers! Th.-Heuss-Str. 61, D-41812 Erkelenz | Go Rhein Fire! Tel.: (+49) 2431/72651 | Use Debian GNU/Linux! Email: Michael@Fam-Meskes.De | Use PostgreSQL!