We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Published bySarina Burkes
Modified over 2 years ago
2005 © SWITCH PERT – Beyond Fat Pipes Simon Leinen
2005 © SWITCH 2 Contents End-to-end performance initiatives and PERT history Example PERT activities: GN2-PACE and SWITCH Lessons learned so far How Grid developers and users can benefit from PERT
2005 © SWITCH 3 End-to-End Performance Initiatives Motivation Observation: Backbone improvements not reflected at end users Frustrations with differentiated-QoS mechanisms Ideas for improvement Education (close the “wizard gap”) Measurement infrastructures – In the network, e.g. GN2-JRA1 – In the hosts, e.g. Web100 Human support infrastructure → PERT
2005 © SWITCH 4 Example PERT Initiatives: GN2 PERT GN2 “PACE” (formerly known as “SA3”) PERT Oriented towards European projects—including Grids Large virtual team with participants from many NRENs Weekly “Case Manager” duty, rotating between organisations ttp://www.pert.geant2.net/ (still being built)ttp://www.pert.geant2.net/ ttp://kb.pert.switch.ch/ (Pilot Knowledge Base)ttp://kb.pert.switch.ch/
2005 © SWITCH 5 Example PERT Initiatives: SWITCH PERT Includes support for performance of the “commodity” Internet Small team from our NOC/network engineering group Other NRENs are building PERT groups as well but these are the two I’m most familiar with…
2005 © SWITCH 6 DEISAThroughputReduction Example GN2 PERT Issue Iperf (single-stream TCP) measurements between the German and French DEISA sites usually achieve 900 Mb/s. DEISA traffic uses Premium IP inside the GEANT backbone. In parallel, there are 2-3 Gb/s throughput tests between Karlsruhe and CERN, using LBE (Less Than Best Effort) inside GEANT. Although there shouldn’t be an impact, DEISA measurements drop to 400 Mb/s during the Karlsruhe/CERN tests.
2005 © SWITCH 7 DEISAThroughputReduction Issue (2) DEISA Iperf test traffic Normal DFN-GEANT traffic
2005 © SWITCH 8 DEISAThroughputReduction Issue Possible Avenues Towards Resolution: Missing QoS configuration on DFN's router to GEANT Try TCP variants that fill the pipe more easily (e.g. BIC, FAST) More measurements (delay/loss/reordering when with bg. traffic?) Is this a practical problem at all?
2005 © SWITCH 9 Slow access to download.microsoft.com Example SWITCH PERT Issue Users at site X observe low download speeds from software distribution site (30-70 kbps)
2005 © SWITCH 10 Download Issue (2) First tests from a test host close to X result in good rates (30-40 Mbps) → probably an issue within site X, right? $ wget http://download.microsoft.com/.../dotnetfx.exe Resolving download.microsoft.com... 188.8.131.52, 184.108.40.206 Connecting to download.microsoft.com[220.127.116.11]:80... connected. HTTP request sent, awaiting response... 200 OK Length: 24,265,736 [application/octet-stream] 100%[====================================>] 24,265,736 4.49M/s ETA 00:00 13:44:22 (3.54 MB/s) - `dotnetfx.exe' saved [24265736/24265736]
2005 © SWITCH 11 Download Issue (3) However, subsequent tests reproduce rates similar to what the customer observed. $ wget http://download.microsoft.com/.../dotnetfx.exe Resolving download.microsoft.com... 18.104.22.168 Connecting to download.microsoft.com[22.214.171.124]:80... connected. HTTP request sent, awaiting response... 200 OK Length: 24,265,736 [application/x-msdownload] 12% [===> ] 2,968,483 7.37K/s ETA 51:32 Further investigation shows that mapping of download.microsoft.com to actual hosts is highly variable, and the performance of the servers mapped to is even more variable.
2005 © SWITCH 12 Download Issue (4) Because SWITCH doesn’t entertain business relationships with Microsoft of its content distributors, suggested that our customer complain to Microsoft (of which they are also a customer). Although technically a PERT failure, customer seems happy.
2005 © SWITCH 13 Lessons Learned So Far It’s hard to establish contacts with the customer It’s easy to “lose” the customer Performance expectations are often unclear Very hard to close an issue – Lack of criteria for problem resolution Should think in terms of bottlenecks rather than “problem locations”
2005 © SWITCH 14 How Grid Community Can Benefit Today PERT Knowledgebase (ttp://kb.pert.switch.ch/)ttp://kb.pert.switch.ch/ Lots of performance-related information In the process of being built Contact the PERT in case of performance problems If it happens when using GEANT/GN2 After other avenues have been explored (campus system and networking support) Through your NREN or (for groups such as DEISA) directly New: PERT Consultancy Service Ask PERT for help with future applications/tests (proactive)
2005 © SWITCH 15 How the Grid Community can Help PERT Follow the project and provide constructive criticism Volunteer as GN2 PERT Subject Matter Expert (SME) Make the concept known within your communities Bring interesting cases before the PERT
2005 © SWITCH 16
2005 © SWITCH PERT – Beyond Fat Pipes Simon Leinen.
Connect. Communicate. Collaborate The Performance Enhancement Response Team: Origins and Evolution Ann Harding, HEAnet Toby Rodwell,
Connect. Communicate. Collaborate PERT Performance Enhancement & Response Team Toby Rodwell, DANTE Joint Techs, New Mexico USA 7 February 2006.
Outline Minimum Spanning Tree Maximal Flow Algorithm LP formulation 1.
Impact of Background Traffic on Performance of High-speed TCPs
2006 © SWITCH End-to-end Performance over Research Networks Simon Leinen, SWITCH Wizard gap, PERT, performance monitoring, Premium IP.
Fill in missing numbers or operations
Connect. Communicate. Collaborate Click to edit Master title style PERT OPERATIONS.
PERT – EVN-NREN –Amsterdam 28/1/05 – Toby Rodwell The PERT and Network Performance Monitoring EVN-NREN, Amsterdam 28//01/05.
Route Optimisation RD-CSY3021.
Connect. Communicate. Collaborate TNC Bruges, 22 May 2008 GÉANT2: The Good the Bad and the Ugly - What worked and what didn’t work? Robin G. Arak.
The Impact of Soft Resource Allocation on n-tier Application Scalability Qingyang Wang, Simon Malkowski, Yasuhiko Kanemasa, Deepal Jayasinghe, Pengcheng.
1 Click here to End Presentation Software: Installation and Updates Internet Download CD release NACIS Updates.
ATMAN HB summary seminar # Challenges 2 ATMAN project 9/17/2010.
NORDUnet 25 years Hans Wallberg SUNET University of Umeå The Future of NORDUnet.
Cache Storage For the Next Billion Students: Anirudh Badam, Sunghwan Ihm Research Scientist: KyoungSoo Park Presenter: Vivek Pai Collaborator: Larry Peterson.
Page 1 / 18 Internet Traffic Monitor IM Page 2 / 18 Outline Product Overview Product Features Product Application Web UI.
Multi Domain Monitoring NORDUnet 2008 Espoo, Jon Kåre Hellan, UNINETT R&D.
1. XP 2 * The Web is a collection of files that reside on computers, called Web servers. * Web servers are connected to each other through the Internet.
The IP Revolution. Page 2 The IP Revolution IP Revolution Why now? The 3 Pillars of the IP Revolution How IP changes everything.
Connect. Communicate. Collaborate The perfSONAR Network Monitoring Framework Maurizio Molina (on behalf of Nicolas Simar) DANTE COST TMA tech. Seminar.
Introduction to Management Science
Debugging end-to-end performance in commodity operating system Pavel Cimbál, CTU, Sven Ubik, CESNET,
How The Internet Changed the Game Presented by: Duston Barto from Infinicom USA.
Nicolas Simar, Network Engineer 12/01/2005 Brussels DANTE GN2-JRA1 Performance Monitoring.
Internet Control Message Protocol Version 4 (ICMPv4)
XP New Perspectives on Browser and Basics Tutorial 1 1 Browser and Basics Tutorial 1.
Unleashing the Power of IP Communications Calling Across The Boundaries Mike Burkett, VP Products April 25, 2002.
Around the World AdditionSubtraction MultiplicationDivision AdditionSubtraction MultiplicationDivision.
1 Introduction of IPv6 in Vienna University's LAN, ACOnet, VIX, ccTLD name service Wilfried Wöber, UniVie - ACOnet for FLIP-6, San Jose, CR Octoberber.
On Individual and Aggregate TCP Performance Lili Qiu Yin Zhang Srinivasan Keshav Cornell University 7th International Conference on Network Protocols Toronto,
1 Titre de la diapositive SDMO Industries – Training Département MICS KERYS 09- MICS KERYS – WEBSITE.
Spring 2014 RMS/EOC Proctor Caching Training. Agenda 2 Proctor caching overview Downloading & installing Cache test content.
Distributed Systems Architectures
FIREWALL TECHNOLOGIES Tahani al jehani. Firewall benefits A firewall functions as a choke point – all traffic in and out must pass through this single.
TCP/IP Protocol Suite 1 Chapter 18 Upon completion you will be able to: Remote Login: Telnet Understand how TELNET works Understand the role of NVT in.
Chapter 20 Network Layer: Internet Protocol
Hosted Voice Product Training Business Group Administrator
1 European benchmarking with the CAF ROME 17-18th of November 2003.
TCP Probe: A TCP with Built-in Path Capacity Estimation Anders Persson, Cesar Marcondes, Ling-Jyh Chen, Li Lao, M. Y. Sanadidi, Mario Gerla Computer Science.
1 Quality of Service Issues Network design and security Lecture 12.
Configuring your VLAN Presented by Gregory Laffoon.
Computer Networks TCP/IP Protocol Suite.
EUMEDCONNECT GEANTs Advanced Services -- Agnès Pouélé 1 GEANTs Advanced services EUMEDCONNECT APM meeting Paris 19th of March 2002.
Sample Service Screenshots Enterprise Cloud Service 11.3.
WA Dept of Commerce DLT Session The Future, Social Media & the Public Sector Social Media Trends - What the 3 May 2012 Perth Western.
® Microsoft Office 2010 Browser and Basics.
© 2017 SlidePlayer.com Inc. All rights reserved.