Saw this on a couple of FreeBSD mailing lists and thought it sounded interesting. Some of the methods used seem similar to the upcoming npf firewall in NetBSD 6.0 where network packets are abstracted as chained buffers
http://netbsd.gw.com/cgi-bin/man-cgi...NetBSD-current.
Quote:
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netmap is a novel system that puts together good ideas from existing proposals to achieve wire-speed packet processing in FreeBSD
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http://info.iet.unipi.it/~luigi/netmap/
