R. Caceres. Multiplexing Traffic at the Entrance to Wide-Area Networks. PhD dissertation, University of California at Berkeley, Computer Science Division, December 1992.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....to measure end to end delay and packet losses in the internet over differing time scales. AS92] and [DSJ93] also measured end to end delays and packet losses of UDP packets. Previous work has also been done in the analysis of specific TCP connections over the Internet. DJ91] RCM91] and [Cac92] empirically measured the characteristics of TCP connections for a variety of applications and built a standard library that could be used in wide area network simulations. Pax94] measured the behavior of TCP traffic in wide area networks and derived analytical models that describe the ....

R. Caceres. Multiplexing Traffic at the Entrance to Wide-Area Networks. PhD dissertation, University of California at Berkeley, Computer Science Division, December 1992.

....can be described as well by analytic models as by empirical models; bulk transfer traffic is best modeled using log normal distributions; except for NNTP, connection interarrivals are well modeled using a non homogeneous Poisson process with fixed hourly rates. Caceres et al. Caceres 91, Caceres 92, Danzig 92a] presented conversation level analysis of wide area TCP traces collected on three local area networks: two campus networks (the University of Southern California (USC) and the University of California at Berkeley (UCB) and one industrial research site (Bellcore) Traces from UCB and ....

R. Caceres, Multiplexing Traffic at the Entrance to Wide-Area Networks, Ph. D. Dissertation, Computer Science Division, Department of EECS, University of California, Berkeley, 1992.

....but that 88 characteristics of the conversation arrival process itself do. They admit that they were unable to form a realistic and network independent model of conversation arrivals, since the arrival parameters depend on geographic site, day of week, time of day, and possibly other factors [114]. Paxson [61] provides further evidence that traffic patterns vary greatly, both over time and more so from site to site, not only in traffic cross section but also in connection characteristics. Paxson and Floyd [58] use fifteen wide area traces to investigate the extent to which TCP arrival ....

R. Caceres, Multiplexing Traffic at the entrance to wide-area networks. PhD thesis, University of California, Berkeley, December 1992. ICSI TR 92/717.

....different endto end sessions on a virtual circuit means that a packet that expects low delay, such as a telnet session, may suffer queueing delays behind a large block because the round robin scheduler is not scheduling individual sessions. These issues were studied in conjunction with Xunet in [CACE92, SARA94A]. In order to provide a good quality LAN interconnection service, end systems and or routers must avoid inducing congestion on the wide area network. Using simulation, we explored end to end performance when TCP s end to end congestion control scheme (TCP Tahoe) is used in conjunction with an ....

....only on end to end flow control and does not explore use of congestion control between routers at the edges of the ATM network. When we began work on Xunet, AAL4 had been proposed for data service on ATM and we investigated the efficiency of IP encapsulation using this adaption layer. Caceres [CACE92] collected packet traces from our Internet gateway and we used the histogram of packet sizes to estimate efficiency. In some cases, IP encapsulation in AAL4 resulted in link utilizations as low as 65 . As a result of this study, we defined a payload type in the ATM cell header to mark the end of ....

R. Caceres, "Multiplexing Traffic at the Entrance to Wide-Area Networks," PhD thesis, U. C. Berkeley, December 1992 (Report No. UCB/CSD 92/717).

....resources. It is envisaged that the majority of the data application or best effort traffic such as the TCP IP traffic in the Internet, will be carried over ABR service in ATM networks. There are a number of studies published in the literature about best effort traffic over high speed networks [1, 2] and TCP traffic dynamics over ATM networks [3] Much of these work has focused on the throughput problems introduced by the interaction of datagram network applications and non flow controlled plain ATM network. Two flow control schemes were proposed in the ATM Forum for supporting ABR service: ....

R. Caceres, "Multiplexing Traffic at the Entrance to Wide-Area Networks", Tech Report No.UCB/CSD 92/171, University of California at Berkeley, Dec. 1992

....window of 8 kB. The y axis shows the effective throughput as a fraction of the maximum possible effective throughput. On the x axis is 4 For a packet that does not break down into an integer number of cells, the effective throughput does not include bytes from the padding in the last cell. See [C92] for proposals to reduce bandwidth inefficiencies due to such size mismatch. Five TCPs, 64 kB Windows, plain ATM Switch Buffer Size (in kB) 0 100 200 300 400 0.4 0.6 0.8 1.0 o o o o o o o o o o o o o o o o o o o 512 bytes packet 1500 bytes packet 4352 bytes packet 9180 bytes packet ....

R. Caceres, "Multiplexing Traffic at the Entrance to Wide-Area Networks", Ph.D. thesis, Report No. UCB/CSD 92/717, University of California at Berkeley, Dec. 1992.

.... that collect air, precipitation or radiation values show this pattern[11] Under this issue it is also worth noting, that message trace measurements for LANs[17] reported 99 of TCP messages in a university campus environment to be less than 200 bytes long, with a large fraction around 10 bytes[19]. Earlier studies gave a median message length value of 128 bytes[18] For WAN traffic, 99.7 of the transferred data were not more than 500 bytes long[17] The overhead for initiating such a transfers, switching into the kernel, and processing the transport protocol are much higher than for the ....

R. Caceres. Multiplexing Traffic at the Entrance to Wide-Area Networks. PhD. thesis, University of California, Berkeley, December 1992.

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