Fast UNIX Servers
Everyone ought start with Dan Kegel's classic site, "The C10K Problem" (still updated from time to time). Everything here is advanced followup material to Dan's excellent work.
- "sendfile(): fairly sexy (nothing to do with ECN)" on lkml
- "mmap() sendfile()" on freebsd-hackers
- [http://unix.derkeiler.com/Newsgroups/comp.unix.programmer/2008-05/msg00001.html "sharing memory map between processes (same parent)" on comp.unix.programmer