文档介绍：P4P:P2P产业可持续发展的必经之路
谢海永博士,首席研究员
美国分布式计算工业联盟(DCIA)
P4P工作组(P4P Working Group)
@
09/25/2008
P4P、 P2P、BT互联网视频产业研讨会
2
Outline
Problem Statement
Requirements and Challenges
The P4P Framework
Objective
Architecture
Performance
P4P Working Group
History, Structure
Next Steps
09/25/2008
P4P、 P2P、BT互联网视频产业研讨会
3
P2P Bandwidth Usage
CacheLogic Research
Protocol Breakdown 1993 - 2006
Traffic
Up to 60-70% of traffic is contributed by P2P applications [CacheLogic]
Random peering causes traffic spread across PoPs and domains
Problems
work resource usage (., using bandwidth of more links)
work operational costs
Degraded performance of other applications
09/25/2008
P4P、 P2P、BT互联网视频产业研讨会
4
The battle results in a lose-lose situation
Bandwidth Battle
ISPs Approaches
work infrastructure
Deploy P2P caching devices
Terminate user connectivity
Rate-limit P2P traffic
……
P2P Countermeasures
Use random ports
Hide by using well-known ports
Encrypt traffic
……
Government
Network Neutrality
09/25/2008
P4P、 P2P、BT互联网视频产业研讨会
5
The Fundamental Problem
Traditional ISP feedback/controls to application traffic:
Routing
Rate control through congestion feedback (., packet loss)
These are ineffective for P2P
P2P traffic is highly dynamic and scattered, due to dynamic, unguided (network-oblivious) peer selection
Need a mechanism for ISPs municate with P2P work structure and policies
09/25/2008
P4P、 P2P、BT互联网视频产业研讨会
Solution: 堙堵 or 疏导?
问题:当尧之时,天下犹未平。洪水横流,泛滥于天下。草木畅茂,禽兽繁殖。禽兽逼人,兽蹄鸟迹之道交于中国
方法一:堙堵。鲧堙洪水,汨陈其五行。帝乃震怒,不畀其洪范九畴,彝伦攸。鲧则殛死,禹乃嗣兴
方法二:疏导。禹疏九河,沦济漯而注诸海,决汝汉排淮泗而注之江,然后中国可得而食也。当是时也,禹八年于外,三过家门而不入,虽欲耕,得乎
09/25/2008
P4P、 P2P、BT互联网视频产业研讨会
7
Solution Requirements & Challenges
Efficiency
ISPs: work utilization
P2Ps: higher performance
End-users: better experiences
Nation: less expenses in upgrading infrastructure
09/25/2008
P4P、 P2P、BT互联网视频产业研讨会
8
Solution Requirements & Challenges
Extensibility
Universally applicable to most P2P architectures
T