Hi, > i have a video decoder program run as aplication > and i now have change the HZ from 1000 to 100, set the decoder program > priority as 99. Seems you are mixing things here... The HZ change will just change the interval of the timer tick. For some more explanations about this, look here : http://kerneltrap.org/node/464 > if i want to the video decoder program to get more time to run, is > there any other way to improve it ? Maybe using nice? Try "man nice" in a terminal on your Linux box to get more explanations about this. Cheers, Philippe--- Scarlet ONE - Combine ADSL with unlimited fixed phone and save 400 euros http://www.scarlet.be