Analysis of TCP's computational energy cost for mobile computing

Authors:
Bokyung Wang;Suresh Singh
Affiliations:
Portland State University, Portland, OR;Portland State University, Portland, OR
Venue:
SIGMETRICS '03 Proceedings of the 2003 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
Year:
2003

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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.