LyraNET: A zero-copy TCP/IP protocol stack for embedded systems

Authors:
Mei-Ling Chiang;Yun-Chen Li
Affiliations:
Department of Information Management, National Chi-Nan University, Puli, R.O.C.;Department of Information Management, National Chi-Nan University, Puli, R.O.C.
Venue:
Real-Time Systems
Year:
2006

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Abstract

Embedded systems are usually resource limited in terms of processing power, memory, and power consumption, thus embedded TCP/IP should be designed to make the best use of limited resources. Applying zero-copy mechanism can reduce memory usage and CPU processing time for data transmission. Power consumption can be reduced as well.In this paper, we present the design and implementation of zero-copy mechanism in the target embedded TCP/IP component, LyraNET, which is derived from Linux TCP/IP codes and remodeled as a reusable software component that is independent from operating systems and hardware. Performance evaluation shows that TCP/IP protocol processing overhead can be significantly decreased by 23---63%. Besides, object code size of this network component is only 77.64% of the size of the original Linux TCP/IP stack. The experience of this study can serve as the reference for embedding Linux TCP/IP stack into a target system that requires network connectivity and improving the transmission efficiency of Linux TCP/IP by zero-copy implementation.