I spent some time over the weekend playing around with different network
configurations and collecting latency results. Hopefully this is
interesting to the people on this list.

http://www.coverfire.com/archives/2011/02/21/network-latency-experiments/

Experiments
1) Linux defaults
2) Reduce buffers
3) Reduce buffers + SFB
4) Reduce buffers + SFQ

Each was tested under upstream load, downstream load and bidirectional
load.