Refer to - http://www.infinitegrid.org/drupal/content/Nails

Nails bangs it all together, mostly via the command pump.


Not sure where else to put this, but nails I think is the bit that
drives the network traffic the most -

http://gettys.wordpress.com/2013/07/10/low-latency-requires-smart-queuing-traditional-aqm-is-not-enough/


Another article that deals with network issues in a 3D networked game -

http://www.gamasutra.com/view/feature/131781/the_internet_sucks_or_what_i_.php?print=1