Ramon Caceres. Efficiency of ATM Networks in Transporting Wide-Area Data Traffic, December 1991. Submitted to Computer Networks and ISDN Systems.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....optimizations [11] and specialized hardware [5] are beyond the scope of our work. While these solutions can improve the end to end performance of a Web system, they do not directly solve the problem of Web server efficiency. Therefore, our research will leverage off existing work in this field [2, 4, 5] and will focus on the following tasks: 1. Implementing a high performance Web server. This task is partially completed, but further work is needed. The research aspects to this work involve applying further adaptive optimization strategies and empirically verifying the impact of each strategy. ....

Ramon Caceres. Efficiency of ATM Networks in Transporting Wide-Area Data Traffic, December 1991. Submitted to Computer Networks and ISDN Systems.

....over ATM networks. Even without ABR, significant interactions between TCP and ATM have been found. Comer showed that ATM s large MTU s can cause deadlocks when TCP buffers are not appropriately enlarged [12] It has also been shown that the cell segmentation of TCP packets causes poor performance [13] because of high cell overhead and fragmented cell loss. Fragmented cell loss occurs when only a cell losses are distributed across many packets rather than a few packets. Some form of intelligent cell discarding is often recommended [14, 15] There have been a number of studies on TCP ....

Ramon Caceres, "Efficiency of ATM networks in transporting wide-area data traffic", submitted to Computer Networks and ISDN Systems, 1991. 17

....different types of traffic, both for wide area and local area networks. While significant effort has been devoted to study the performances of guaranteed services, the best effort service (called Available Bit Rate or ABR traffic in the ATM Forum) has received some attention only recently [1, 5, 7, 8]. Best effort service is highly desirable for carrying data traffic, since it enables an early usage of ATM technology for existing data applications; besides, since the network has to make a conservative allocation of the available bandwidth and buffer space to offer the guaranteed services, ....

R. Caceres, Efficiency of ATM Networks in Transporting Wide-Area Data Traffic, TR-91-043 ICSI, Berkeley CA, July 1991

....(IP) is currently the most commonly used network protocol. TCP and UDP applications have made email, Network File System (NFS) Telnet, and FTP available on almost every workstation and personal computer. The success of a network will be influenced by its ability to efficiently transport IP data [32]. For these experiments, Fore s TCP IP device driver was installed. A simple shell script, as shown in Figure 4.5, executed ttcp to gather performance results. The TCP IP performance results are plotted in Figure 4.6. For each data point, a constant amount of data was transmitted (in this case, 8 ....

R. Caceres, "Efficiency of ATM networks in transporting wide--area data traffic." Tech. Rep., The University of California at Berkeley, 1991.

....with 53 byte ATM cell technology inherits those qualities. The ATM Adaptation Layer protocol, AAL, is required to fragment network layer messages into smaller ATM cells and then reassemble them at the destination. This is a large source of overhead for the current internetwork traffic mix [1]. The ATOMIC effort adapted multicomputer communication to networking [2] ATOMIC s base is Mosaic multicomputing technology. The Mosaic technology was developed under DARPA support by Professor Charles Seitz and his students at Caltech [3] It employs a variant of cut through routing [4] to ....

Caceres, R. Efficiency of ATM Networks in Transporting Wide-Area Data Traffic Computer Science Dept., University of California, Berkeley, CA. December 1991.

....a lot of capacity will go to waste in padding out the last cell in the frame. Other researchers say that this can be solved by techniques such as the concatenation of frames within a virtual connection, header compression, etc. Some contend that this isn t as big a problem as it first seems. see [6], 1] et al. for more on this topic. Do we need a separate high speed packet network This issue is related to that of congestion control. Packet networks exhibit very bursty traffic, and there are good reasons to treat packets in their entirety rather than as a collection of cells. Multiplexing ....

R. Caceres, Efficiency of ATM Networks in Transporting Wide-Area Data Traffic,» Dec 1991, Submittet to Computer Networks and ISDN Systems.

....small, fixed size cells acceptable, and is the standard 48 byte cell payload a poor choice The only effective way to address these issues is to evaluate the impact of actual IP traffic. IP traffic distributions published by Ramon Caceres in 1989 [10] and subsequent analysis in an ATM context [11], provided the inspiration for our own experiments. The data in [10] was based on the traffic between the main gateways of three U.S. institutions and The Internet . As the predominant transport protocol was TCP, the analysis in [11] focussed on WAN oriented TCP traffic. Various methods of ....

....Caceres in 1989 [10] and subsequent analysis in an ATM context [11] provided the inspiration for our own experiments. The data in [10] was based on the traffic between the main gateways of three U.S. institutions and The Internet . As the predominant transport protocol was TCP, the analysis in [11] focussed on WAN oriented TCP traffic. Various methods of stripping and compressing redundant information to improve the potential inefficiency of ATM transport were identified. However, the new encapsulation standards were not available at the time and so are not incorporated into the analysis. ....

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Ramon Caceres, "Efficiency of ATM Networks in Transporting Wide-area Data Traffic", submission to Computer Networks and ISDN systems, December 1991.

....of short packets (e.g. acks) since it depend on the number of long packets, but overall, the impact on the percentage of bytes in long packets will be small. In practice, the distribution of bytes between long and short depends on the environment in which the network is used. One traffic study [3] for general internet traffic indicates that about 80 of the bytes are in long packets. The average short packet size is 100 bytes in that study. We expect a higher percentage of bytes in long packets in supercomputer or distributed computing environments. Figure 5 shows the saturation throughput ....

Ramon Caceres. Efficiency of ATM Networks in Transporting Wide-Area Data Traffic. Submitted for publication, 1992.

....Contract No. DEAC03 76SF00098. 1 The ATM Forum is an international consortium whose goal is to accelerate the use of ATM products and services through the development of interoperability specifications and the promotion of industry cooperation. ATM for best effort data traffic (exceptions are [C91, SC93, C93, HKM93]) Since ATM does not provide Media Access Control, it has been a concern that the throughput will be low if an ATM network experiences congestion; in fact there is already practical evidence to this effect [C94] This paper uses simulation studies to investigate the throughput behavior of TCP ....

R. Caceres, "Efficiency of ATM Networks in Transporting Wide-Area Data Traffic", TR-91-043 International Computer Science Institute, Berkeley, CA, July 1991.

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R. Caceres, "Efficiency of ATM Networks in Transporting Wide-Area Data Traffic," Submitted to Computer Networks and ISDN Systems, December, 1991.

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