Quality assurance and adaptation of internet services: Early experience

End-to-end quality of Web service is determined by both network delays and server response time with respect to web pages. A Web page often contains an HTML base and multiple static or dynamic objects that are embedded in the base. This paper presents an overview of our recent research experience with server resource management for client-perceived pageview response time assurance and adaptation. The main thrusts are two feedback control approaches that regulate server resource allocation at run-time in response to the change of input traffic and server load conditions. One is a model predictive feedback controller and the other is model-free self-tuning fuzzy controller. Their effectiveness and sub-second control accuracy are demonstrated on PlanetLab.