A Proportional Delay Differentiated QoS Guaranteed Server: Resource Provisioning and Dynamic Class Adaption
(John C.S. Lui)

The goal of this project is to construct a web server that can provide a N classes of differentiated service to different types of clients. Rather than using a strict priority policy, which may lead to starvation, the web server provides a proportional delay differentiated service to different clients. Specifically, the web server operator can specify a performance spacing between classes. Requests in class i+1 is guaranteed to have a smaller average waiting time than the class i request. With this type of proportional delay differentiated service, the web server can provide a consistent performance spacing among different clients. Each client, on the other hand, has a maximum waiting time requirement which he wants the web server to guarantee. In our web server, efficient admission control algorithms are applied so that it can provide the QoS guarantee. How the clients can adapt to the traffic loading of the web server dynamically is also being considered.