Diffusion Model of Preemptive-Resume Priority Systems and Its Application to Performance Evaluation of SDN Switches

Abstract

The increasing use of Software-Defined Networks brings the need for their performance analysis and detailed analytical and numerical models of them. The primary element of such research is a model of a SDN switch. This model should take into account non-Poisson traffic and general distributions of service times. Because of frequent changes in SDN flows, it should also analyze transient states of the queues. The method of diffusion approximation can meet these requirements. We present here a diffusion approximation of priority queues and apply it to build a more detailed model of SDN switch where packets returned by the central controller have higher priority than other packets.

Fluid-Flow Approximation in the Analysis of Vast Energy-Aware Networks

“…SDN provides flexible and scalable routing, link failure recovery, load balancing, and security issues. As we have seen already with the use of diffusion approximation studying small SDN topologies, the SDN network is most of the time in a transient state due to frequent decisions of the controller [77,78]. Therefore, any optimization of its performance should be based on transient state modeling.…”