Tcp

http://lwn.net/Articles/418918/#Comments Interesting discussion on LWN about an article describes problem with packet loss on home broadband networks due to improper buffer sizes in various network gear (routers, cable/dsl modems, switches, etc) along the route path.

http://fasterdata.es.net/TCP-tuning/ Excellent site provides both theoretical background and practical recommendation for the situation when you need to push limits of TCP links using regular OS and commodity hardware. Especially useful if you need to do it via long-haul fast TCP link, i.e. the situation when you normally use specialized networking hardware (read: cisco)