[freenet-dev] maximum connections & nio

[Zlatin Balevsky]

Since with nio we can afford to keep 256-512 connections open (and well 
tuned uber-nodes can go way over 1000), we should rethink whether LRU is 
still the best strategy for replacing existing connections.  Currently 
the connection that has had least activity is being dropped when a new 
one is needed.

However, if we're going to keep connections open to every node in the 
routing table, we should perhaps change that to an LFU strategy.  
There's no point to award a recently active but rarely used connection 
at the expense of one that has proven to be used often. 

The overall idea is to minimize the number of session restarts which 
(until session v2 comes out) require heavy crypto. 

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