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Richard Hughes-Jones The University of Manchester hep.man.ac.uk/~rich/ then “Talks”

The Uptake of High Speed Protocols or Are these protocols making their way into everyday use ? Panel Discussion. Richard Hughes-Jones The University of Manchester www.hep.man.ac.uk/~rich/ then “Talks”. Which Protocol for my Network. Lab to Lab Lightpath Many application share

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Richard Hughes-Jones The University of Manchester hep.man.ac.uk/~rich/ then “Talks”

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  1. The Uptake of High Speed ProtocolsorAre these protocols making their way into everyday use ?Panel Discussion Richard Hughes-Jones The University of Manchesterwww.hep.man.ac.uk/~rich/ then “Talks” ESLEA Closing Conference, Edinburgh, March 2007, R. Hughes-Jones Manchester

  2. Which Protocol for my Network ESLEA Closing Conference, Edinburgh, March 2007, R. Hughes-Jones Manchester

  3. Lab to Lab Lightpath • Many application share • Classic congestion points • TCP stream sharing and recovery NEEDED • Advanced TCP stacks Transports for LightPaths • Host to host Lightpath • One Application • No congestion • Lightweight framing ESLEA Closing Conference, Edinburgh, March 2007, R. Hughes-Jones Manchester

  4. Transports for Academic Networks • High Bandwidth Backbones • But care needed with Access links – Countries and Campus • Many Application flows • Note the Digital Divide • Roles for Advanced TCP stack and other transports. • Many different technologies – often low Bandwidths • Cautious/conservative Transport Protocols • Standard TCP • Linux & BIC • Microsoft & C-TCP Transports for Global Internet ESLEA Closing Conference, Edinburgh, March 2007, R. Hughes-Jones Manchester

  5. Transport Protocols • TCP • Reno; HS-TCP; Scalable; H-TCP; C-TCP; BIC; CUBIC; LCTP • XCP • UDP • Some applications NEED this form of delivery • RTP / RTSP • Lots of streaming applications available now • DCCP • Interest from e-VLBI • multicast ESLEA Closing Conference, Edinburgh, March 2007, R. Hughes-Jones Manchester

  6. Potential Problems • Advanced TCP stacks cant be used at my site because: • Security concerns • My Grid software MUST HAVE version 2.4.-200 ! • Disk performance limits throughput • Depends how the storage is arranged • Hight performance SANs – Commercial Data Centres • RAID systems • Distributed disks - dcache • Network congestion • Campus • MAN • Backbone • Long distances eg Australia ESLEA Closing Conference, Edinburgh, March 2007, R. Hughes-Jones Manchester

  7. Gridmon from last week SJ5 Transition 10% packet loss to RAL ESLEA Closing Conference, Edinburgh, March 2007, R. Hughes-Jones Manchester

  8. Some Areas for Discussion • What is the interaction between Application and Transport Protocol? • What is the relative importance of fairness vs throughput? • rtt fairness (OK what is fairness?) • mtu fairness • TCP friendliness • How to AIMD rate fluctuations relate to stability & sharing? • Stability of Achievable Throughput • Does provable stability of protocols matter? • Is the computational complexity of a protocol important? • What is the relative importance of convergence time? • Link utilisation (by this flow or all flows) • Should there be a bias towards "mice“? – Applications • Is conceptual simplicity of the protocol important? ESLEA Closing Conference, Edinburgh, March 2007, R. Hughes-Jones Manchester

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