TCP IN A WORLD OF CLOUD SERVICES
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1 TCP IN A WORLD OF CLOUD SERVICES Jiang Zhu Stanford University In collaboration with: Nandita Dukkipati, Sateesh Addepalli, Flavio Bonomi Cisco Systems
2 CLOUD SERVICES
3 WHAT IS THE DEMO ABOUT? Long wait times in accessing the cloud TCP inefficiencies: RTTs losses load
4 DEMO MOTIVATION: PAINFULLY LONG UPLOAD TIMES Proliferating user generated content Uploads take a long time End user wants: Share the content at the soonest possible
5 DEMO SET UP: LOGICAL TOPOLOGY Other users: Cross Traffic
6 DEMO SCENARIO I: UPLOADS ON HIGH BDP LOSSY LINKS Bottleneck Other users: Cross Traffic 100 ms RTT between user and server; 0.1% packet loss is 45Mbps; is GE; No cross-traffic
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20 TCP Performance Upload to the Server. Average: 5.31 Mbps Throughput versus Time Link: 45 Mbps, Loss Rate 0.1%, RTT 100ms Throughput [Mbps] Time [sec.] Upload to Throughput the Service versus Time Link: Node. 45 Mbps, Loss Average: Rate 0.1%, RTT 100ms 30 Mbps Throughput [Mbps] Time [sec.]
![1%, RTT 100ms Throughput [Mbps] 0 10 20 30 40 0 200 400 600 800 1000 Time [sec.](/docs-images/45/7727637/images/page_20.jpg "] Upload to Throughput the Service versus Time Link: Node. 45 Mbps, Loss Average: Rate 0.")
21 THE DEMO: SCENARIO 1I bottleneck Other users: Cross Traffic 100 ms RTT between user and server; No packet loss is 45Mbps; is 45Mbps; Heavy cross-traffic
22 TCP Performance DC link average: 39 Mbps; User 1: 4.39 Mbps Throughput versus Time Link: 45 Mbps, RTT 10ms Time [sec.] Upload to the Service Node. Average: 43.3 Mbps Throughput versus Time Link: 45 Mbps, RTT 10ms Throughput [Mbps] Throughput [Mbps] Time [sec.]
23 EXAMPLE OF OTHER SCENARIOS: UPLOADING TO MULTIPLE SITES Flickr User 1: Uploading Pictures User 2: Viewing Pictures
24 CONCLUSION TCP in a world of cloud computing will not be a train wreck in the sense that things come to a grinding halt But... It will be agonizingly slow in common scenarios Lost opportunities in not exploring alternatives?
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