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The Packet Filter: An Efficient Mechanism for User-Level Network Code Export

ACM Operating Systems Review, SIGOPS In Proceedings of the 11th ACM Symposium on Operating Systems Principles ({SOSP}), Vol. 21, No. 5. (1987), pp. 39-51.

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Code to implement network protocols can be either inside the kernel of an operating system or in user-level processes. Kernel-resident code is hard to develop, debug, and maintain, but user-level implementations typically incur significant overhead and perform poorly. The performance of user-level network code depends on the mechanism used to demultiplex received packets. Demultiplexing in a user-level process increases the rate of context switches and system calls, resulting in poor...


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