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Titolo:
Performance analysis of data packet discarding in ATM networks
Autore:
Kim, Y; Li, SQ;
Indirizzi:
Univ Texas, Dept Elect & Comp Engn, Austin, TX 78712 USA Univ Texas Austin TX USA 78712 pt Elect & Comp Engn, Austin, TX 78712 USA
Titolo Testata:
IEEE-ACM TRANSACTIONS ON NETWORKING
fascicolo: 2, volume: 7, anno: 1999,
pagine: 216 - 227
SICI:
1063-6692(199904)7:2<216:PAODPD>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Keywords:
badput; buffer threshold; early packet discarding; goodput; packet-level control; packet loss probability; packet tail discarding; stochastic modeling;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Kim, Y Cisco Syst Inc, San Jose, CA 95134 USA Cisco Syst Inc San Jose CA USA 95134 t Inc, San Jose, CA 95134 USA
Citazione:
Y. Kim e S.Q. Li, "Performance analysis of data packet discarding in ATM networks", IEEE ACM TN, 7(2), 1999, pp. 216-227

Abstract

Data performance in asynchronous transfer mode (ATM) networks should be measured on the packet level instead of the cell level, since one or more cell losses within each packet is equivalent to the loss of the packet itself,Two packet-level control schemes, packet tail discarding and early packet discarding, were proposed to improve data performance. In this paper, a newstochastic modeling technique is developed for performance evaluation of two existing packet-discarding schemes at a single bottleneck node, We assume that the data arrival process is independent of the nodal congestion, which may represent the unspecified bit-rate traffic class in ATM networks, where no end-to-end feedback control mechanism is implemented. Through numerical study, we explore the effects of buffer capacity, control threshold, packet size, source access rate, underlying high-priority real-time traffic, and loading factor on data performance, and discuss their design tradeoffs. Our study shows that a network system can be entirely shut down in an overload period if no packet-discarding control scheme is implemented, under the assumption that there are no higher layer congestion avoidance schemes. Further, unless with sufficiently large buffer capacity early packet discarding (EPD) always outperforms packet tail discarding (PTD) significantly under most conditions. Especially under the overload condition, EPD can alwaysachieve about 100% goodput and 0% badput, whereas the PTD performance deteriorates rapidly. Among all the factors, the packet size has a dominant impact on EPD performance. The optimal selection of the EPD queue control threshold to achieve the maximum goodput is found to be relatively insensitive to traffic statistics.

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Documento generato il 24/09/20 alle ore 23:30:45