CS536- - High Performance Switching and Routing Telecom Center Workshop Sept 4 197 Congestion Control for High Bandwidth-Delay Product Environments

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Unformatted text preview: High Performance Switching and Routing Telecom Center Workshop: Sept 4, 197. Congestion Control for High Bandwidth-Delay Product Environments Dina Katabi Mark Handley Charlie Rohrs TCP congestion control performs poorly as bandwidth or delay increases Round Trip Delay (sec) A v g . T C P U t i l i z a t i o n Bottleneck Bandwidth (Mb/s) A v g . T C P U t i l i z a t i o n Shown analytically in [Low01] and via simulations Because TCP lacks fast response • Spare bandwidth is available ⇒ TCP increases by 1 pkt/RTT even if spare bandwidth is huge • When a TCP starts, it increases exponentially ⇒ Too many drops ⇒ Flows ramp up by 1 pkt/RTT, taking forever to grab the large bandwidth 50 flows in both directions Buffer = BW x Delay RTT = 80 ms 50 flows in both directions Buffer = BW x Delay BW = 155 Mb/s Proposed Solution: Decouple Congestion Control from Fairness High Utilization; Small Queues; Few Drops Bandwidth Allocation Policy Proposed Solution: Decouple Congestion Control from Fairness Example: In TCP, Additive-Increase Multiplicative-Decrease (AIMD) controls both Coupled because a single mechanism controls both How does decoupling solve the problem?...
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This note was uploaded on 10/24/2009 for the course CS 536 taught by Professor Sonia,f during the Spring '08 term at Purdue University-West Lafayette.

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CS536- - High Performance Switching and Routing Telecom Center Workshop Sept 4 197 Congestion Control for High Bandwidth-Delay Product Environments

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