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Re:One Million Concurrent TCP connections by gorset on Friday September 23, 2011 @03:12PM (#3031176)
That's actually accept_filter(9). The man page for freebsd has a interesting info:

    The accept filter concept was pioneered by David Filo at Yahoo! and
    refined to be a loadable module system by Alfred Perlstein.
The closest you can get by using kqueue is to set a low water mark, so that a read event is only returned when there's enough data ready.
Re:One Million Concurrent TCP connections by Flow on Friday September 23, 2011 @03:48PM (#3031320)
Ah, that's it! Thanks for finding it.