An analysis of Internet content delivery systems
ACM SIGOPS Operating Systems Review
In the span of only a few years, the Internet has experienced an astronomical increase in the use of specialized content delivery systems, such as content delivery networks and peer-to-peer file sharing systems. Therefore, an understanding of content delivery on the Internet now requires a detailed understanding of how these systems are used in practice. This paper examines content delivery from the point of view of four content delivery systems: HTTP web traffic, the Akamai content delivery
... work, and Kazaa and Gnutella peer-to-peer file sharing traffic. We collected a trace of all incoming and outgoing network traffic at the University of Washington, a large university with over 60,000 students, faculty, and staff. From this trace, we isolated and characterized traffic belonging to each of these four delivery classes. Our results (1) quantify the rapidly increasing importance of new content delivery systems, particularly peerto-peer networks, (2) characterize the behavior of these systems from the perspectives of clients, objects, and servers, and (3) derive implications for caching in these systems. Overview of Content Delivery Systems Three dominant content delivery systems exist today: the client/server oriented world-wide web, content delivery networks, and peer-to-peer file sharing systems. At a high level, these systems serve the same role of distributing content to users. However, the architectures of these systems differ significantly, and the differences affect their performance, their workloads, and the role caching can play. In this section, we present the architectures of these systems and describe previous studies of their behavior.