Bokyung Wang
Abstract
In this paper we present results from a measurement study of TCP (Transmission Control Protocol) running over a wireless link. Our primary goal was on obtaining a breakdown of the computational energy cost of TCP at the sender and receiver (excluding radio energy costs) as a first step in developing techniques to reduce this cost in actual systems. We analyzed the energy consumption of TCP in FreeBSD 5 running on a wireless laptop. Our initial results showed that 60 - 70% of the energy cost (for transmission or reception) is accounted for by the Kernel -- NIC (Network Interface Card) copy operation. Of the remainder, 15% is accounted for in the copy operation from user space to kernel space with the remaining 15% being accounted for by TCP processing costs. We then further analyzed the TCP processing cost and determined the cost of computing checksums accounts for 20 -- 30% of TCP processing cost.
- Laura Feeny and Martin Nilsson. Investigating the energy consumption of a wireless network interface in an ad hoc networking environment. In Proceedings INFOCOM 2001, Anchorage, Alaska, 2001.Google Scholar
Cross Ref
- M. Srivastava P. Lettieri, C. Schurgers. Adaptive link layer strategies for energy efficient wireless networking. In Wireless Networks, volume 5, pages 339--355, 1999. Google ScholarDigital Library
- M. Zorzi, M. Rossi, and G. Mazzini. Throughput and energy performance of tcp on a wideband cdma air interface. In Journal of Wireless Communications and Mobile Computing, Wiley 2002, 2002. Google ScholarDigital Library
Index Terms
- Analysis of TCP's computational energy cost for mobile computing
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Analysis of TCP's computational energy cost for mobile computing
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