Internet2 E2EPIEnd-2-End Performance Initiative

Jeff W. BooteInternet2

29 May 2006

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Vision: Performance Information is …

• Available•People can find it (Discovery)• “Community of trust” allows access across

administrative domain boundaries (AA)

• Ubiquitous•Widely deployed (Paths of interest covered)•Reliable (Consistently configured correctly)

• Valuable•Actionable (Analysis suggests course of action)•Automatable (Applications act on data)

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Getting There: Build & Empower the Community

Decouple the Problem Space:•Analysis and Visualization•Performance Data Sharing•Performance Data GenerationGrow the Footprint:•Clean APIs and protocols between each layer•Widespread deployment of measurement infrastructure•Widespread deployment of common performance measurement tools

Analysis & Visualization

Measurement Infrastructure

Performance Tools Performance

Tools

Analysis & Visualization

Measurement Infrastructure

API

API

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Result: No more mystery …

• Increase network awareness•Set user expectations accurately

• Reduce diagnostic costs•Performance problems noticed early •Performance problems addressed efficiently•Network engineers can see & act outside their turf

• Transform application design• Incorporate network intuition into application

behavior

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Immediate Game-plan:

• Internet2 is leveraged to help provide diagnostic information for “backbone” portion of problem•Create *some* diagnostic tools•Make Abilene data as public as is reasonable

• Work on efforts to more widely make performance data available (perfSONAR)•Contribute to ‘base’ development• Integrate ‘our’ diagnostic tools as ‘good’ example

MP/MA services

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BWCTL (Bandwidth Controller)

• What is it?A resource allocation and scheduling daemon for

arbitration of iperf tests

• Typical Solution•Run “iperf” or similar tool on two endpoints and hosts

on intermediate paths

• Typical road blocks•Need permissions on all systems involved•Need to coordinate testing with others•Need to run software on both sides with specified test

parameters

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BWCTL: 3-Party Flow Diagram

bwctlclient

bwctld(request broker)

requests/

results

requests/results

verify time/

return resultsbwctld

(peer agent)

teststream

iperf(test process)

bwctldresource broker

(master daemon)initialconnection

initial

connection

resoure

requests

bwctld(request broker)

bwctld(peer agent)

iperf(test process)

bwctldresource broker

(master daemon)

reso

urce

requ

ests

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OWAMP: One-Way Active Measurement Protocol

• What is it?• Measures one-way latency: 1-way ping• Control connection used to broker test

request based upon policy restrictions and available resources. (Bandwidth/disk limits)

• Specification• http://tools.ietf.org/wg/ippm/draft-ietf-ippm-

owdp/draft-ietf-ippm-owdp-14.txt

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OWAMP Flow Diagram

Server

owpingclient

[Control]

Requests/

Results

owampd[Resource Broker]

Initialconnection

owampd[Control]

OWD TestEndpoint

OWD TestEndpoint

Requests/

Results

Client

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Thrulay Overview

• Network capacity and delay tester• Same class of tools as iperf, netperf, nettest, nuttcp, ttcp,

etc.• Unique features not found in other tools:

• TCP: measures round-trip delay along with goodput• UDP: measures:

• One-way delay, with quantiles• Packet loss• Packet duplication• Reordering

• UDP: ability to send precisely positioned true Poisson streams (microsecond errors in sending times)

• Human and machine-readable (ready to be fed to gnuplot)

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Thrulay Update

• New release v0.8• Tests with multiple TCP streams• Set DSCP (a.k.a. first 6 bits of the TOS byte)• Report MTU and/or MSS (whichever the OS makes available)• More UDP statistics: duplication, reordering, quantiles of delay• SPARC/Solaris support• Mac OS X support• IPv6 support• Non-busy-waiting UDP mode (less precise, but can run more

concurrent tests)• Documentation: manual pages have been added• Basic client authorization based on IP address• Integration of TSC timekeeping projects for faster and more

precise timestamping

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NDT: Network Diagnostic Tool

• Web100 enhanced server handles testing and diagnostic services

• Java based and command line clients allows testing from any client (local or remote)

• Performance and configuration faults reported back to client

• Drill-down functions provide more details & error reporting capabilities

• Grant from NIH/NLM to explore duplex mismatch detection

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NDT Flow Diagram

Client

Web

Browser

Java

Applet

NDT - Server

Web

Server

Testing

Engine

Child

Test Engine

Spawn child

Well KnownNDT Server

Web RequestRedirect msgWeb Page Request

Web page response

Test Request

Control Channel

Specific test channels

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Bulk Transport

• Build a library / tool for bulk transport that does not require kernel level modifications yet achieves the performance of such

• VFER library•Congestion control hooks• Implements loss-based congestion control•Working on delay-based version

• File transfer utility•An initial version demoed

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Everything we work on is available

• Tools are open source, supported, well-documented

• BWCTL/Iperf, OWAMP, NDT are deployed across Abilene backbone and at many partners

• You can:•See ongoing measurement results at the

Abilene Observatory•Test to/from the Abilene backbone

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Network Performance Measurement Workshops

•Example Course Materials:• http://e2epi.internet2.edu/npw/presentations.html

Goals:•Grow installed base of BWCTL/Iperf, OWAMP, and

NDT at GigaPoP and regional campuses.• http://e2epi.internet2.edu/pipes/pmp/pmp-dir.html

•Begin integration into IT support processes.•Create an installed base for perfSONAR

deployment.•Give each participant tool-specific cookbooks.

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Network Performance MeasurementWorkshop Locations and Dates

•Completed• SOX / GaTech (03/05)• CENIC / UCLA (06/05)• JT – Vancouver (07/05)• OARNet / OSU (09/05)• MAGPI / FMM (09/05)• MAX / College Park (12/05)• APAN (01/06)• JT - Albuquerque (02/06)• MERIT (02/06)• Columbia / NYSERNet

(04/06)• University of Virginia

(04/06)

•Planned• Wisconsin (07/06)

•Under Consideration• Alaska, …

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Collaboration

• Working Groups• Bulk Transport (transport.internet2.edu)

• GGF Network Measurement (nmwg.internet2.edu)

• perfSONAR (www.perfsonar.net)

• Funded Research• “Bridging the Gap” (NSF)• Network Measurement for International Connections

• Google Summer of Code• 2005 very successful• 2006 just beginning

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Current and Future work

• LHC OWAMP measurements• AMI/pSonar MA interface (perl)

• AMP MA interface (Ga Tech)• Light Path Control-plan tie-in (Dragon project)

• Do more paths need to be provisioned?• The control-plane issues are similar - can pS services be

leveraged?

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