Queue - Open Source
Study of Server Processing Load Evaluations in Ubiquitous Communication Environments
SAINT-W '06 Proceedings of the International Symposium on Applications on Internet Workshops
ISPASS '03 Proceedings of the 2003 IEEE International Symposium on Performance Analysis of Systems and Software
TCP offload is a dumb idea whose time has come
HOTOS'03 Proceedings of the 9th conference on Hot Topics in Operating Systems - Volume 9
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In ubiquitous environment, terminal-initiated traffics(e.g. , sensor data streams) will become more popularized than human-initiated traffics(e.g. , web browsing, file transfer, and media streaming). The characteristics of the terminal-initiated traffics can be described as the streams of small sized packets with the large number of simultaneous connections. Thus, an ubiquitous service server will suffer from the burden of the terminal-initiated traffics since the per-packet-cost of a CPU will increase proportionally with the number of terminals. In this paper, we propose Latona architecture that offloads not only TCP/IP processing but also parts of socket processing from a host to minimize the per-packet-cost of a CPU in a Linux server. Based on the experimental results, the Latona kernel could save 50% and 79% of the kernel execution time of send() and recv() for 32 bytes transfer in the legacy TCP/IP stack. The packet-per-second were 21.9K and 18.3K for send() and recv() ,respectively. The bandwidth increased as the size of payload increased. The profile of detail execution time showed that the bottleneck of the Latona was for handling the socket and the TCP in Latona hardware.