Performance Analysis of Buffer Management Scheme of Dynamic Dual Queue with Queue Threshold

A buffer management scheme of dynamic dual queue with queue threshold(DDQQT)is proposed for a shared buffer packet switches,the scheme can allocate buffer on demand.The key of the dynamic dual queue with queue threshold is to enhance the fairness to meet the QoS(Quality of Service)guarantees for different service classes and the overall utilization of the buffer.An associated M_1+M_2/M/1/K+(K)queueing model is established,Q matrix is given,stead-state probability distribution is worked out by using matrix-geometric solutions.Based on it,some performance evaluations such as queue length densities and loss probabilities of the two classes packets are given.