ABSTRACT

Delay and Delay Variation Measurements in a DS Test Network

(speaker: Tiziana Ferrari)

The ongoing diffserv experiments carried out by of the TF-TANT task 
force in the framework of the Quantum Test Programme analyze several
diffserv functional blocks like policing, marking, scheduling and 
packed drop algorithms in a Europe-wide diffserv testbed and on
different diffserv router platforms.
We provide an overview of these activites and we illustrate in detail
the results of one-way delay and instantaneous packet delay variation
measurement when applied to the Expedited Forwarding PHB.

QoS measurement was deployed to study the impact of the EF service rate
and buffer dimensioning on EF performance. In addition, two different 
EF scheduling algorithms have been tested and compared: 
Weighted Fair Queuing and Priority Queuing. Finally, EF has been 
tested in the wide area to study the effect on end-to-end performance 
of multiple EF aggregation points, of congestion and of aggregation of
multiple EF micro-flows into the same class. 
The presentation reviews the main achievements in each of these areas.

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References:

- Diffserv test programme of the TF-TANT task force, reports and
  detailed descriptions of test results:
	http://www.cnaf.infn.it/~ferrari/tfng/ds/
- QoS Monitoring test programme of the TF-TANT task force, reports and
  test results:
	http://www.cnaf.infn.it/~ferrari/tfng/qosmon/
- The TF-TANT home page:
	http://www.dante.net/tf-tant/