1. © 2007 BitTorrent Inc. Quality of Application: QoS is Dead, Long Live Politeness Ben Teitelbaum Product Marketer, Content Delivery Services Product Manager, Device Programs

2. © 2007 BitTorrent Inc. physics.bigu.educern.ch Quality of Application(s) QoA Not just about your application Multiple apps make up end-user experience Sometimes doing with less increases overall utility Design applications 1 for the best end-user experience 1. Network matters too, but should not be tuned for specific apps

3. © 2007 BitTorrent Inc. Politeness QoS is dead, but politeness has a long history of success Ethernet CSMA/CD TCP congestion control QBone Scavenger Service (LBE) throughput (C x MTU) / (RTT x sqrt(loss))

4. © 2007 BitTorrent Inc. QoA at BitTorrent BitTorrent DNA: peer-accelerated HTTP streaming Delivery via CDN ($$$) and DNA peer network ($) Smart piece-picking Maximize peer use while ensuring smooth playback Painless seeding Polite transport protocol defers to TCPs Delay-based congestion control anticipates packet loss Seeding wont disrupt gaming, web-surfing, or VoIP TCP throughput (C x MTU) / (RTT x sqrt(loss))