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PERT Performance Enhancement & Response Team

PERT Performance Enhancement & Response Team. Toby Rodwell, DANTE Joint Techs, New Mexico USA 7 February 2006. Agenda . Background PERT Organisation PERT Systems Experience to date The future for the PERT. Motivation .

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PERT Performance Enhancement & Response Team

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  1. PERTPerformance Enhancement & Response Team Toby Rodwell, DANTE Joint Techs, New Mexico USA 7 February 2006

  2. Agenda • Background • PERT Organisation • PERT Systems • Experience to date • The future for the PERT

  3. Motivation • Historically, long distance circuits (the “wide-area”) have been the bottleneck in a network • In recent years, the capacity of long distance circuits has significantly increased • End-to-end performance bottle-necks may now occur at any point in a system – end-system (application, OS, hardware), LAN or WAN • As such, it is becoming more and more difficult for a non-expert end-user to diagnose their network performance issues

  4. Origins of the PERT • Conception of the PERT … Jan 01 Internet2 Meeting • A support structure to investigate and resolve problems in the performance of applications over computer networks • Comparable to CERT structure • Realization of the PERT … Dec 2002 TERENA meeting • 6 European NRENs (GARR, SWITCH, CESnet, HEAnet and UKERNA) and DANTE committed to a practical trial of a basic PERT

  5. The PERT Today • Permanently staffed (8x5) • CARNET, CESNET, FCCN, GARR, HUNGARNET, PSNC, RENATER, SWITCH • PERT Ticket System (PTS) • PERT Knowledgebase (PERT-KB) • PERT documentation • PERT Troubleshooting Guide • Performance User Guide and Best Practice Guide

  6. PERT Organization • PERT Managers • Toby Rodwell (DANTE), Simon Leinen (SWITCH) • Case Managers • Duty Case Managers (weekly changing) • Special Case Managers • Subject Matter Experts • Unfunded volunteers • From NRENs, academia and industry • Work on an ‘as and when’ basis

  7. PERT Systems • PERT Knowledgebase (PERT KB) • http://pace.geant2.net/cgi-bin/twiki/view/PERTKB/WebHome • Updated on an ongoing basis • PERT Ticket System (PTS) • https://www.pert.geant2.net/pert/welcome.do • Currently Version 1 • Design of Version 2 about to start

  8. Experiences to date • Low number of PERT cases • Plan to open up access to the PERT • Most of these concerned with low throughput over large BDP (Bandwidth Delay Product) paths • Often US to Europe • Even packet loss of 0.002% has significant impact

  9. General Findings • For long distance, high data rate transfers • Default TCP settings insufficient (buffers too small) • Jumbo packets are important (GEANT (and now GEANT2) promoting the Abilene recommendation of 9000 byte IP packets) • Other common performance problem • Mismatched Ethernet duplex settings • (Not seen so far by GN2 PERT, but a known problem)

  10. The Future of the PERT • Involve more volunteer Subject Matter Experts • Gain more experience • Investigating more cases • Using new tools (perfSONAR) • Disseminate the lessons learned • Promote the PERT as a NOC function • Disestablish the centralised PERT

  11. Any Questions? Toby Rodwell, DANTE

  12. Contacting the PERT • To date, only authorised Primary customers are able to submit a request for help • Primary Customers are NRENS and some pan-European projects • The PERT has recommended that access be widened to allow anyone to submit a case (the DCM would filter and prioritise requests) • Under consideration

  13. Case Managers • Special Case Managers (SCMs) • For complex or drawn out cases a Special Case Manager (SCM) will take over and manage a case through to its closure • Work on a ‘best efforts’ basis • Duty Case Managers • Weekly-changing • Receive requests, assess eligibility, open new cases, set priorities and start investigations • Responsible for progressing all cases without an SCM, or where the SCM is unavailable

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