Design And Implement Web QoS Control System Based On Dynamic Schedule Algorithm

With the development of the computer network and multimedia technologies, the Web application and HTTP requests on the Internet is increasing explosively, and many web sites hava to face the problem of the server overload. Web Quality of Service is generally influenced with two elements:the quantity of service of network's transfer layer and the performance of the web server. Recently, the server's processing power in some degree is becoming the bottleneck of the QoS control. Therefore, web server to achieve quality control becomes an urgent problem how to resolve. So, it reseaches the QoS control on the thesis.First, this thesis analysis the current direction of Web QoS technology research, as well as domestic and foreign research. They exist the question of flexibility, versatility, scalability, so it introduces that it goes on the Web QoS control int the SPI, Service Provider Interface, and it introduce the key technology.Second, it designs and implements a web QoS control system based on the dynamic scheduling algorithm. It proposes a dynamic scheduling algorithm with Web QoS control, and designs a Web QoS control system based on the characteristics that SPI intercepte packets in the past, which provides the server overload protection and the service distinction. System includes the QoS module, overload protection module, classification module, dynamic scheduling module.Finally, it takes experiments and performance analysis based on the foundation of NS2 simulation and the designed control system. It takes the simulation test for the QoS dynamic scheduling algorithm through the expand the NS2, and it shows that it has advantages at the average throughput and loss rate. In addition, it takes the overload protection and performance test, it shows that it has good role to the overload protection for the server, avoids the server overload, and improves the performance of the server.