A New Internet-Draft is available from the on-line Internet-Drafts
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Title : Performance Evaluation of EF-ADMIT
Author(s) : J. Gunn, et al.
Filename : draft-gunn-tsvwg-ef-admit-evaluation-00.txt
Pages : 22
Date : 2007-2-26
A new Differentiated Services Code Point (DSCP), EF-ADMIT, has been
recommended for a class of real-time traffic conforming to the
Expedited Forwarding (EF) Per Hop Behavior (PHB) and admitted using a
strong Call Admission Control (CAC) procedure incorporating capacity
assurance, as compared to a class of real-time traffic conforming to
the EF PHB but not subject to strong CAC. This document presents
modeling results demonstrating that EF-ADMIT traffic will experience
low packet drop rates even when lack of strong CAC results in EF
traffic experiencing high packet drop rates. The modeling shows the
performance benefit is material at low to medium network access
speeds (e.g., 256 Kb/s to 1.5 Mb/s), but relatively inconsequential
at high access speeds (e.g., 45 Mb/s) and, by inference, backbone
speeds (100Mb/s and higher) where more bandwidth headroom is assumed.
Furthermore, mixing relatively long packets (e.g., 1500 byte video
packets) with relatively short packets (e.g., 200 byte voice packets)
in EF PHB causes significant degradation to short packet performance
at low to medium access speeds. Finally, the results show that
implementation can be effective utilizing either one queue with
combined EF and EF-ADMIT flows, or two queues with one forEF-ADMIT
flows and one for EF flows, with the choice of approach mostly a
matter of policy.
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