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A TCP Instrumentation and Its Use in Evaluating Roundtrip-time Estimators

出版	University of Maryland, 1990
URL	http://books.google.com.hk/books?id=B2R_tQAACAAJ&hl=&source=gbs_api

註釋

We describe an instrumentation of TCP/IP that monitors TCP connections and provides values of internal variables of the implementation. We define interface events for a TCP/IP connection, describes how traces are obtained, and how application processes initiate trace collection. The instrumentation has been implemented in 4.3BSD UNIX. The instrumented TCP/IP provides a flexible environment for experimental studies. Using the instrumentation, we have studied the performance of different roundtrip-time estimators in the Internet environment. One conclusion of our study is that clock resolution is an important parameter, and the resolution currently used in UNIX implementations of TCP is woefully inadequate. Another conclusion is that, with an adequate clock resolution, a recently proposed estimator performs substantially better than the estimator suggested in the TCP specifications. Keywords: TCP(Transmission Control Protocol), Information transfer, Computer networks. (KR).