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16 December 1998 Packet discarding inside a SIMA network: a waste of network resources?
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Proceedings Volume 3529, Internet Routing and Quality of Service; (1998)
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States
Simple Integrated Media Access (SIMA) is a network service based on drop preference bits in every packet. A key characteristic of SIMA is that the packet discarding decision are made locally without any knowledge about the load condition in other parts of the network. A possible problem of SIMA is that some packets could be lost in the last node after they have gone through the whole network. This seems to be a waste of network resource,s as some other packets could be transmitted in the network instead of the packets discarded in the last node. The question addressed in the paper is how much a network may profit by using perfect information about the network load condition in a way that the goodput in maximized by discarding packets only in the first node. A network with 5 nodes has been evaluated with a large number of different load conditions. The results show that the average benefit is less than 2 percent of the network capacity if the overall packet loss ratio is at most 20 percent. Only if the average packet los ratio is very high, could the benefit be significant.
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Kalevi Kilkki, Ove Strandberg, and Jussi Pekka Olavi Ruutu "Packet discarding inside a SIMA network: a waste of network resources?", Proc. SPIE 3529, Internet Routing and Quality of Service, (16 December 1998);

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