GPS(Generalized Processor Sharing) is one of fluid models for scheduling
and some algorithms
such as WFQ(Weighted Fair Queueing) and WF
2
Q(Worst-case Fair WFQ)
etc.
are based on the simulation of GPS.This paper proves that WFQ
WF
2
Q
are not the packet-by-packet GPS.Therefore
these algorithms cannot guarantee the delay and services characteristics of P-GPS.A new Packet Fair Scheduler based on the exact simulation of GPS is proposed.