BibTeX
@MISC{Guojun01projectsummary,
author = {Jin Guojun},
title = {Project Summary Report: Bandwidth Estimations and Its Applications},
year = {2001}
}
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Abstract
High-performance distributed computing relies on high-speed network connectivity, which is in turn dependent on the availability of high-bandwidth physical links and computers fast enough to process the data packets. In recent years, the speed of CPUs and networks has increased consistently so that now, on scientific research networks, the theoretical maximum bandwidth available to applications is over one gigabit per second. This dramatic increase in network speed has not been realized because most applications ’ network utilization (fraction of the available bandwidth used by the application) is quite poor. This discrepancy between the experienced bandwidth and the physical bandwidth has been referred to as the "Wizard Gap". Although there are software factors limiting the bandwidth of connections, notably TCP settings such as buffer and congestion windows, one has to also take into account the current routing configuration and current bandwidth loads on shared network segments. The problem is that there are few tools that can provide accurate information about all these variables for high-speed networks, thus leaving one wondering where the bottleneck is. To fully achieve the maximum bandwidth on a network is not an easy task. Troubleshooting the network elements and diagnosing the myriad of reasons for under-utilized bandwidth can be a daunting task. Network troubleshooting requires not only networking expertise, but also a set of very specialized software tools. Network wizards are aware that network elements can cause performance problem, but they need tools to help them identify problematic network elements. For example, if one could access every router in a network path and examine all the configuration information and statistics
Keyphrases
bandwidth estimation project summary report network element tcp setting accurate information available bandwidth under-utilized bandwidth scientific research network maximum bandwidth high-speed network current bandwidth load software factor experienced bandwidth data packet high-speed network connectivity easy task wizard gap quot current routing configuration theoretical maximum bandwidth networking expertise network wizard problematic network element turn dependent network path application network utilization high-bandwidth physical link configuration information dramatic increase network segment specialized software tool recent year congestion window physical bandwidth performance problem network speed
