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Implementation of a TCP/IP Offload Engine Using High Performance Lightweight TCP/IP  

Jun, Yong-Tae (부산대학교 컴퓨터공학과)
Chung, Sang-Hwa (부산대학교 컴퓨터공학과)
Yoon, In-Su (부산대학교 컴퓨터공학과)
Publication Information
Journal of KIISE:Computing Practices and Letters / v.14, no.4, 2008 , pp. 369-377 More about this Journal
Abstract
Today, Ethernet technology is rapidly developing to have a bandwidth of 10Gbps beyond 1Gbps. In such high-speed networks, the existing method that host CPU processes TCP/IP in the operating system causes numerous overheads. As a result of the overheads, user applications cannot get the enough computing power from the host CPU. To solve this problem, the TCP/IP Offload Engine(TOE) technology was emerged. TOE is a specialized NIC which processes the TCP/IP instead of the host CPU. In this paper, we implemented a high-performance, lightweight TCP/IP(HL-TCP) for the TOE and applied it to an embedded system. The HL-TCP supports existing fundamental TCP/IP functions; flow control, congestion control, retransmission, delayed ACK, processing out-of-order packets. And it was implemented to utilize Ethernet MAC's hardware features such as TCP segmentation offload(TSO), checksum offload(CSO) and interrupt coalescing. Also we eliminated the copy overhead from the host memory to the NIC memory when sending data and we implemented an efficient DMA mechanism for the TCP retransmission. The TOE using the HL-TCP has the CPU utilization of less than 6% and the bandwidth of 453Mbps.
Keywords
TCP/IP Offload Engine; Embedded Systems; TCP/IP; Gigabit Ethernet;
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Times Cited By KSCI : 1  (Citation Analysis)
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