Jay Aikat, Kevin Jeffay Derek O Neill, Ben Newton

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1 Tutorial: Hands-on with Tmix Jay Aikat, Kevin Jeffay Derek O Neill, Ben Newton

2 Outline Hands-on with Tmix 90 mins 30 mins: Tmix demo with discussion 45 mins: you run an experiment 15 mins: how can you use Tmix in your projects Realistic Reproducible Experiments on GENI using Tmix 2

3 Your handout Pages 1-5: General information on Tmix Pages 6-7: Main tutorial instructions Pages 8-11: Instructions for reserving resources through the GENI Portal 3

4 Experiment Workflow Part I: Design/Setup Create a slice and reserve resources through the portal Part II: Execute experiment Run a 10-min Tmix experiment emulating ~25,000 TCP connections as seen on a real production link Part III: Finish Teardown experiment delete/release resources 4

5 What is Tmix? Real Network Link Madison Internet Traffic Generators Traffic Generators Link in a GENI Testbed Given a packet header trace, we can generate synthetic traffic in a simulator or testbed that is statistically equivalent to the measured traffic You can emulate an Internet backbone link on GENI 5

6 Source-level Trace Replay Anonymized Packet Header Trace Processing Source-level Trace: Set of a-t-b-t Connection Vectors Workload Partitioning Traffic Generators Traffic Generators The synthetic trace is statistically equivalent to the original Synthetic Packet Header Trace 6

7 Emulating Each TCP connection Non-parametric modeling Application Data Units (ADUs) Round trip time per connection Sequential vs. concurrent connections request-response exchanges vs. concurrent exchanges 7

8 Simulate Network Traffic on a GENI testbed Router Router Traffic Generators Traffic Generators Laboratory testbed for experiments UNC link to the Internet 8

9 10-min Experiment Traffic generators Generating TCP connections CPU utilization, memory Connection statistics duration, epoch response times In the network: run tcpdump and analyze the pcap trace Node1 (Traffic generator) 100 Mbps Node2 (Router and Monitor) 100 Mbps Node3 (Traffic generator) 100 Mbps Node4 (Router and Monitor) 9

10 10-min Experiment Traffic ~25,000 TCP connections Emulating each connection s minimum RTT Average throughput - ~ 15Mbps and 7Mbps in the two directions Collecting various measurements on the end systems e.g. CPU utilization, memory Connection statistics duration, epoch response times Node1 (Traffic generator) Node3 (Traffic generator) 10

11 Experiment Workflow Part I: Design/Setup Create a slice and reserve resources through the portal 11

12 Experiment Workflow Part I: Design/Setup Create a slice and reserve resources through the portal Part II: Execute experiment Run a 10-min Tmix experiment emulating ~25,000 TCP connections as seen on a real production link 12

13 Experiment Workflow Part I: Design/Setup Create a slice and reserve resources through the portal Part II: Execute experiment Run a 10-min Tmix experiment emulating ~25,000 TCP connections as seen on a real production link Part III: Finish Teardown experiment delete/release resources (save your results first!) 13

14 Experiment Results Traffic generators results files (tmix directory) tmixtutorial.unc incomplete connections tmixtutorial.ts time series of connection stats, and CPU and memory usage tmixtutorial.rt Connection duration, total bytes transferred tmixtutorial.ert Epoch response times 14

15 Performance Metrics: Connection Duration Connection Duration Epoch 1 Epoch 2 Epoch 3 Connection initiator a 1 bytes a 2 bytes a 3 bytes Time b 1 bytes b 2 bytes b 3 bytes Connection acceptor ta 1 ms tb 1 ms ta 2 ms tb 2 ms ta 3 ms Web server 15

16 Performance Metrics: Response Time Response Time Epoch 1 Epoch 2 Epoch 3 Connection initiator a 1 bytes a 2 bytes a 3 bytes Time b 1 bytes b 2 bytes b 3 bytes Connection acceptor Web server 16

17 Tmix Experiments on GENI ProtoGENI PlanetLab 17

18 What s Next? This tutorial was a starting point Tmix enables realistic traffic generation on GENI for any experiments you design Testing network protocols Router testing, queue management Any experiment where you need to simulate network traffic Contact us (aikat@cs.unc.edu) we want to help you use Tmix in your next set of experiments 18

19

20 Thank you! Evaluations Jay Aikat Kevin Jeffay

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