Addressing the problem of congestion, packet scheduling policies are useful, especially to fulfil the real-time constraints of interactive audio-video or remote-control/robotic applications. Fixed priority policies are good on end-to-end notations, and the RSVP is developping quickly. Dynamic Policies are behaving better, where the information is solely in the packets themselves, but they usually require much more processing. Todays technology does make this still cost-effective. This paper evaluates the benefit of LLF (least-laxity first) policies over fixed-priority policies.