Promoting web traffic over a DiffServ architecture

In this paper we present some simulation results about web traffic differentiation. Traditionally, the differentiated services architecture (DiffServ) has been under consideration to providing different services and QoS in Internet. The flow size of the web traffic is important when we intend to achieve certain QoS to these kind of flows. We propose a DiffServ model where short flows are managed with high priority and the maximum QoS. We intend to promote some long flows, but this promotion must not affects the short flows performance. For this purpose, firstly we need to detect the gaps in the bandwidth committed to QoS. Second, some long flows can be promoted over high priority queue, instead of low priority queue. Our proposal has special attention for the very long flows which reduce the web traffic performance. We must detect and penalize these extreme long flows in order to avoid the promotion of these flows and permit others aspirants to be promoted. With these actions we get to improve the global performance of the web traffic. We have used ns2 network simulator tool for the simulation with the PackMime-HTTP object for the realistic synthetic Web traffic generation. We have analyzed some simulation results about web transmission latency and packet loss.