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Why does setsockopt() double SO_RCVBUF?

April 26, 2017double

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Why does setsockopt() double SO_RCVBUF?

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• (REG) This yields similar behaviour as *BSD versions of Unix. Andi Kleen has stated: Linux counts internal headers in the buffer. BSD does not. This is a heuristic for compatibility (half of the buffer reserved for headers). To compensate the TCP window offering is halved.