Computer Systems Organization
The majority of the Internet traffic today is content delivery traffic. The performance of content delivery depends on the efficiency of the routing paths from users to content servers and from content servers back to the users. While content providers can control the paths from their servers to the users, they have no control over the paths from users to their content servers and the efficiency of such paths is generally unknown. In this work, we conduct a case study of Netflix to understand the efficiency of the AS paths from various access ISPs to Netflix servers deployed at IXPs in different regions of the world. We discover inefficient AS paths in Europe, North America, and South America. Paths in South America are especially inefficient as many of them leave the continent. We also analyze long paths in each region, explore their causes, and propose ways to avoid long paths.