Project: See if we can improve performance by throttling busy streams at guard nodes

In particular see http://archives.seul.org/or/dev/Dec-2009/msg00002.html and discussion stemming from Proposal 163. Basically, we want to keep individual clients from hammering the network too hard when we need the banwidth to relay traffic. We have a partial implementation, and Roger says that current next steps are performance measurements of some kind:

Look at bwconnrate and bwconnburst in the consensus. Next step is to do more rigorous performance comparisons (turn it on, off, on, off, compare torperf results).

Child Tickets: [[TicketQuery(parent=legacy/trac#1750 (moved))]]