Carey Williamson
Qian Wu
ABSTRACT
This paper discusses the design and evaluation of CATNIP, a Context-Aware Transport/Network Internet Protocol for the Web. This integrated protocol uses application-layer knowledge (i.e., Web document size) to provide explicit context information to the TCP and IP protocols. While this approach violates the traditional layered Internet protocol architecture, it enables informed decision-making, both at network endpoints and at network routers, regarding flow control, congestion control, and packet discard decisions.The ns-2 network simulator is used to evaluate the performance of the context-aware TCP/IP approach, using a simple network topology and a synthetic Web workload. Simulation results indicate a 10-20% reduction in TCP packet loss using simple endpoint control mechanisms. More importantly, using CATNIP context information at IP routers can produce 20-80% reductions in the mean Web page retrieval times, and 60-90% reductions in the standard deviation of retrieval times.
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Digital Library
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- Context-aware TCP/IP
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