TR-05-6.pdf
``Analysis of Multimedia Workloads with Implications for Internet Streaming",
Lei Guo, Songqing Chen, Zhen Xiao, and Xiaodong Zhang
Proceedings of the 14th International World Wide Web Conference (WWW'2005),
Chiba, Japan, May 10-14, 2005.
Abstract
In this paper, we study the media workload collected from a large number of
commercial Web sites hosted by a major ISP and that collected from a large
group of home users connected to the Internet via a well-known cable company.
Unlike other studies that only focus on the characteristics of streaming or
downloading media traffic either on a client side or on a server side, we
present a comprehensive study of the overall media content delivery mechanisms
on the Internet from both the server side and the client side. Some of our
key findings are: (1) Surprisingly, the majority of media contents are still
delivered via downloading from Web servers. (2) A substantial percentage of
media downloading connections are aborted before completion due to the long
waiting time and low patience of clients, resulting up to 20% pure bandwidth
waste. (3) A hybrid approach, pseudo streaming, is used by clients to imitate
real streaming. Compared with downloading, clients using pseudo streaming
tend to abort more connections and abort earlier due to the early feedback
of the media content, and result in less bandwidth waste. (4) The mismatch
between the downloading rate and the client playback speed in pseudo streaming
is common, which either causes frequent playback delays to the clients, or
unnecessary traffic to the Internet. (5) Compared with streaming, downloading
and pseudo streaming are neither bandwidth efficient nor performance
effective. Our findings indicate that inadequate streaming support has
caused many clients to suffer from poor quality of service and inefficient
Internet bandwidth utilization. To address this problem, we propose the
design of AutoStream, an innovative system that can provide additional
previewing and streaming services automatically for media objects hosted
on standard Web sites in server farms at the client's will. Our trace driven
simulations show that AutoStream has the potential of greatly improving the
quality of media delivery to clients while reducing network bandwidth usage
substantially.