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Anders Magnusson

An LSR over a commodity ISP. Anders Magnusson. Joint Techs Workshops - July 20, 2004. SUNET Internet Land Speed Record - Network setup. GigaSunet OC-192 core. 10GE. OC192. Sprintlink OC-192 core. End host in Luleå, Sweden. 10GE.

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Anders Magnusson

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  1. An LSR over a commodity ISP Anders Magnusson Joint Techs Workshops - July 20, 2004

  2. SUNET Internet Land Speed Record - Network setup GigaSunet OC-192 core 10GE OC192 Sprintlink OC-192 core End host in Luleå, Sweden 10GE Network path consists of 40(!) router hops, using paths shared with other users of the networks. End host in San Jose, CA July 20, 2004

  3. Records submitted April 14 • 838 860 800 000 bytes in 1588 real seconds = 4226 Mbit/second • 840 Gbytes in less than 30 minutes • Record submitted for the IPv4 single stream class is 69.073 Petabit-meters/second (which is a 12% increase of the previous record) July 20, 2004

  4. Compared with others Compared to the previous record, we can note thatwe achieved this, using • Less powerful end hosts • 150% longer distance • Less than half the MTU size (which generates heavier CPU-load on the end-hosts) • The normal GigaSunet and Sprintlink production infrastructures July 20, 2004

  5. Fiber path for the Internet LSR Distance from Luleå, Sweden to San Jose, CA is approximately 16,343 km (10,157 miles) Actual fiber path exceeds 18,600 km (11,560 miles) July 20, 2004

  6. Network load July 20, 2004

  7. Benefits with an ISP • World-wide network, no need to involve many different network providers • High-quality network • Good service level, short lead time from error report until problem fixed July 20, 2004

  8. Problems with an ISP • May not be able to run network tests anytime, it may disturb other traffic • Other traffic may use significant bandwidth at certain times, must find timeslots to have enough bandwidth available July 20, 2004

  9. Interesting observations • Due to long RTT the TCP startup phase may generate large data bursts on the communication link • The bursts can generate heavier network load during short periods than expected July 20, 2004

  10. Traffic example #1 In a perfect world without packet loss… July 20, 2004

  11. Traffic example #2 TCP startup phase on loaded link July 20, 2004

  12. Traffic example #3 TCP startup phase over a longer period of time July 20, 2004

  13. More to read… • http://proj.sunet.se/LSR2 • Describes how the Land Speed Record was achieved • http://proj.sunet.se/E2E • About end-to-end performance in GigaSunet July 20, 2004

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