Broadband Internet Performance: A View from the Gateway
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1 Broadband Internet Performance: A View from the Gateway Srikanth Sundaresan, Walter de Donato, Nick Feamster, Renata Teixeira, Sam Crawford, Antonio Pescapè Georgia Tech University of Napoli CNRS/UPMC Sorbonne Universités SamKnows
2 What Affects Broadband Performance? Important for regulators, consumers, ISPs Notion of performance is fuzzy What metrics should we measure? How to measure them? Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
3 Accurate Measurements are Difficult Home Network: AT&T DSL 6 Mbps Down, 512 Kbps Up Last Mile ISP Network speedtest.net: 4.4 Mbps, 140 Kbps Netalyzr: 4.8 Mbps, 430 Kbps End host measurements are not continuous, and affected by confounding factors Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
4 The Case For the Gateway Home Network: AT&T DSL 6 Mbps Down, 512 Kbps Up Last Mile ISP Network speedtest.net: 4.4 Mbps, 140 Kbps Netalyzr: 4.8 Mbps, 430 Kbps Gateway: 5.6 Mbps, 460 Kbps Gateway enables periodic measurements, and can account for confounding factors Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
5 The Deployments Last Mile Internet SamKnows/BISmark Nearby Server Breadth: The FCC/SamKnows study 4,000 gateways, 16 ISPs, multiple service plans Depth: The BISmark study 16 gateways in Atlanta, on-demand measurements Duration: Dec 2010 Jan 2011 Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
6 Results: Overview Throughput measurement technique depends on usage scenario Traffic shaping is highly variable across users Access link characteristics affect performance Modem buffers induce high latency Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
7 Results: Overview Throughput measurement technique depends on usage scenario Traffic shaping is highly variable across users Access link characteristics affect performance Modem buffers induce high latency Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
8 Interpreting Throughput Results Different techniques measure different aspects of throughput Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
9 Results: Overview Throughput measurement technique depends on usage scenario Traffic shaping is highly variable across users Access link characteristics affect performance Modem buffers induce high latency Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
10 Traffic Shaping: PowerBoost Cable companies advertise PowerBoost Short bursts of high bandwidth Non-existent in DSL Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
11 Traffic Shaping Varies Across Users Short-term throughput significantly different from sustainable throughput Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
12 Results: Overview Throughput measurement technique depends on usage scenario Traffic shaping is highly variable across users Access link characteristics affect performance Modem buffers induce high latency Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
13 Latency Measurements Parameter End-to-end Last-mile Under Load What it captures Latency to nearby server Latency to edge of ISP network Buffer delays due to cross traffic Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
14 Impact of Last-mile on Latency Cable ISPs DSL ISPs DSL last-mile latencies can be very high Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
15 Example: Latency-Throughput Tradeoff Throughput (Mbits/s) User 2: high latency, low loss User 1: low latency, high loss Both users have same service plan Interleaving decreases loss, increases latency, improves throughput Latency (ms) Interleaving creates a trade-off between latency and throughput Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
16 Results: Overview Throughput measurement technique depends on usage scenario Traffic shaping is highly variable across users Access link characteristics affect performance Modem buffers induce high latency Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
17 Modem Buffers are Too Large 10 seconds! Service plans can interact badly with modem buffers Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
18 Conclusion The gateway provides unique insight into home network Throughput measurements are affected by measurement technique, shaping Latency is affected by last-mile, buffering Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
19 Discussion Limitation and Weakness Evolution (Change in performance over time) One server for US They did not talk about the wire part of the path (routing), as different ISPs have different policy, topology, and peering point Very interesting data set and measurement deployment Openflow Programmable Gateway Broadband Internet Performance: A View from the Gateway ACM SIGCOMM, Toronto., August
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