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I found this because DragonflyBSD just gained support for it as well.

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    Just went to comment that dfly recently commited it than noticed your note.

    Typing this from latest DragonFly v3.5.0.233.ge05769-DEVELOPMENT #0: Thu May 23 23:40:10 CEST 2013 compile, the network stack really is snappy, regardless of the SO_REUSEPORT.

    There’s nothing cleaner than OpenBSD, but DragonFly is my second OS choice currently.