changing re-trans timeout

Ignore-this: 111713b7baf8d6ec6a140010b6539595

darcs-hash:20140210055329-c21fe-74fc8fb808e8bb839fb5b67ceda7d06106adcd6c
reducing udp packet size

Ignore-this: f3b72d71a8e3c92bb5126e22210e93db

darcs-hash:20140210061809-c21fe-ed0c702ed8a8ca59eaf5f40a3e40fd0c6a58f566
udp send performance enhancement

Ignore-this: aa5b5d5a7fc8a09a109eea25f5715d42

darcs-hash:20140210064115-c21fe-c0c982ca6df387a4ee4717cd75c16c0dd591d2fe
proper multiplexing of send and receive

Ignore-this: 68533b897a3e89d22bb2473ec28d7cd7

darcs-hash:20140210144637-c21fe-261eac5d3b70ef4beafb36389727577c840cc068