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Efficient and reliable available bandwidth measurement remains an important goal for many applications. Recently a new class of active probing techniques has emerged which has clear advantages over earlier approaches, prominent members being pathload and pathChirp. They are based on observing an increased separation of probe packets due to local saturation of the queue at the narrow link, and do not require the knowledge of link capacities along the path. Each can deliver reasonable estimates of (average) available bandwidth, but has important drawbacks. Despite the shared general principle, there are many dimensions involved to fully define a given method in the class.
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