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Proceedings Paper

Multiservice platforms carrying IP/ATM/MPLS traffic: impact of heavy-tailed session duration distributions on user-perceived performance
Author(s): Gagan L. Choudhury
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Paper Abstract

Modern communication networks carry several grades of data, voice and video sessions typically using single-service or multi-service platforms employing IP, ATM or MPLS protocol mechanisms. It is well established that in many instances the session duration may have a heavy-tailed distribution [1-2]. We explore the impact of such distributions on the response time performance of user sessions. We concentrate mainly on a single output link (potentially a bottleneck on the data path) of a multi-service platform. First-come-first-served and processor sharing type scheduling mechanisms are considered (weighted fair queueing and weighted round robin are implementable approximations to generalized processor sharing). The output link is modeled as a single-server (no limit on individual session rate) or multiple servers (rate limit on individual sessions either inherently as for CBR applications or for congestion avoidance as in a cable access network). Also, the impacts of bandwidth differences between input and output links are considered. It is observed that in some cases, heavy-tailed session durations have significant impacts but those impacts may be effectively neutralized using appropriate scheduling or rate control mechanisms.

Paper Details

Date Published: 1 July 2002
PDF: 7 pages
Proc. SPIE 4865, Internet Performance and Control of Network Systems III, (1 July 2002); doi: 10.1117/12.473399
Show Author Affiliations
Gagan L. Choudhury, AT&T Labs. (United States)


Published in SPIE Proceedings Vol. 4865:
Internet Performance and Control of Network Systems III
Robert D. van der Mei; Frank Huebner, Editor(s)

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