A Self-Tuning Control for Web QoS

The design of Web QoS based on feedback control has an imperfect real-time because of the offline identification. This paper presents a self-tuning control framework to provide proportional delay differentiation guarantees on Web Server. The approach updates the model and controller parameters based on the variations of object model to reduce system error and optimize the performances through an online identification. The Matlab simulation and network tests show that the controller has some advantages compared with the traditional methods and could maintain the relative delay guarantees well even in poor network environment.