CS536-2009-03-05

CS536-2009-03-05 - Congestion Control for High ong st on...

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Unformatted text preview: Congestion Control for High ong st on ontro for H gh Bandwidth-Delay Product Environments Dina Katabi Mark Handley Charlie Rohrs TCP congestion control performs poorly as andwidth or delay increases bandwidth or delay increases Shown analytically in [Low01] and via simulations 50 flows in both directions Buffer = BW x Delay 50 flows in both directions Buffer = BW x Delay RTT = 80 ms BW = 155 Mb/s Because TCP lacks fast response Because TCP lacks fast response Spare bandwidth is available TCP increases by 1 pkt/RTT even if spare bandwidth is huge hen a TCP starts it increases exponentially Spare bandwidth is available TCP increases by 1 pkt/RTT even if spare bandwidth is huge hen a TCP starts it increases exponentially ound Trip Delay (sec) ottleneck Bandwidth (Mb/s) When a TCP starts, it increases exponentially Too many drops Flows ramp up by 1 pkt/RTT, king forever to grab the large bandwidth When a TCP starts, it increases exponentially Too many drops Flows ramp up by 1 pkt/RTT, king forever to grab the large bandwidth Round Trip Delay (sec) Bottleneck Bandwidth (Mb/s) taking forever to grab the large bandwidth taking forever to grab the large bandwidth Proposed Solution: Decouple Congestion Control from Fairness High Utilization; Small Queues; Bandwidth Allocation Few Drops Policy Proposed Solution: Decouple Congestion Control from Fairness Example: In TCP, Additive-Increase Multiplicative- Coupled because a single mechanism controls both...
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CS536-2009-03-05 - Congestion Control for High ong st on...

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