Pod Switch Manager Circuit Switch Manager Topology Manager 15 CSE 222A Lecture

# Pod switch manager circuit switch manager topology

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Pod Switch Manager Circuit Switch Manager Topology Manager 15 CSE 222A – Lecture 10: Hybrid Networks

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Outline of Control Loop 1. Estimate traffic demand 2. Compute optimal topology for maximum throughput 3. Program the pod switches and circuit switches 16 CSE 222A – Lecture 10: Hybrid Networks
1. Estimate Traffic Demand Question: Will this flow use more bandwidth if we give it more capacity? 1. Identify elephant flows (mice don’t grow) Problem: Measurements are biased by current topology 2. Pretend all hosts are connected to an ideal crossbar switch 3. Compute the max-min fair bandwidth fixpoint Mohammad Al-Fares, Sivasankar Radhakrishnan, Barath Raghavan, Nelson Huang, and Amin Vahdat. Hedera: Dynamic Flow Scheduling for Data Center Networks . In NSDI’10. 17 CSE 222A – Lecture 10: Hybrid Networks

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2. Compute Optimal Topology 1. Formulate as instance of max-weight perfect matching problem on bipartite graph 2. Solve with Edmonds algorithm 1 2 3 4 1 2 3 4 Source Pods Destination Pods a) Pods do not send traffic to themselves b) Edge weights represent interpod demand c) Algorithm is run iteratively for each circuit switch, making use of the previous results 18 CSE 222A – Lecture 10: Hybrid Networks
Example: Compute Optimal Topology 19 CSE 222A – Lecture 10: Hybrid Networks

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Example: Compute Optimal Topology 20 CSE 222A – Lecture 10: Hybrid Networks
Example: Compute Optimal Topology 21 CSE 222A – Lecture 10: Hybrid Networks

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Traditional Network Helios Network 100% bisection bandwidth (240 Gb/s) 22 CSE 222A – Lecture 10: Hybrid Networks
Hardware 24 servers u HP DL380 u 2 socket (E5520) Nehalem u

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• Fall '08
• Vahdat,A
• Channel capacity, switch, Goodput, Crossbar switch, hybrid networks

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