上海交通大学：《通信网络》课程PPT教学课件（讲稿）Communication Networks - ANALYSIS OF 10G EEE PROTOCOL

世 Shanghai Jiao Tong University ANALYSIS OF 10G EEE PROTOCOL cation Networks

Communication Networks ANALYSIS OF 10G EEE PROTOCOL Shanghai Jiao Tong University

Outline Problem System Modeling Vacation model Power efficiency P-K formula of Mean delay Performance Tradeoff Conclusion ommunication Networks

Communication Networks Outline • Problem • System Modeling – Vacation model – Power efficiency – P-K formula of Mean delay • Performance Tradeoff • Conclusion

Number of ethernet Devices is Huge GAGR:10.70o 60 59 40 R A20 20132014201520162017201820192020 Year ommunication Networks

Communication Networks Number of Ethernet Devices is Huge

Link rate increases very fast ITb/s in 2015 10 400Gb/sin2013 105 100GE Sandard AOGE Standar core 10GE standard networkS server ports I GE standard 99520002005201020152020 Year ommunication Networks

Communication Networks Link Rate Increases Very Fast

Power Consumption vs Link rate 20 16 12 IOME 100ME IGE IOGE Year -1982 1995:1998 2004 ommunication Networks

Communication Networks Power Consumption vs. Link Rate

However. Link utilization 30% >70%time is idle but inter face is power on 80 60 95 20 01503004506007509001050120013501500 Time (seconds) cation Networks

Communication Networks However, Link Utilization 70% time is idle but interface is power on

10GBase-T Energy Efficient Ethernet IEEE 802.3az: interfaces go to sleep when IdlE frame departure Low Power Idle (LPD frame arrival Counter: 1 Counter: N Timer 0 or Timer: it 100% cation Networks

Communication Networks 10GBase-T Energy Efficient Ethernet • IEEE 802.3az: interfaces go to sleep when IDLE

Role of Two thresholds Timer t bounds the delay when traffic load is low Timer expires first Low Power Idle (LPD) Counter n bounds the queue length when traffic load is high Counter expires first ≌ Low Power Idle/s (LPD) ommunication Networks

Communication Networks Role of Two Thresholds

Sleeping Strategies I&n policy: T and n are finite t policy:N→∞ N policy:τ→∞ ommunication Networks

Communication Networks Sleeping Strategies

Problem Tradeoff between power efficiency and delay N and T↑→ LPI Length↑ power efficiency↑ average delay↑ Example: 86% power is wasted for overheads ifN=1 Q乐 100 10% Our goal: what are the rules to select N and t? ommunication Networks

Communication Networks Problem