Quality of Service
Previously, we focused on increasing the efï¬ciency of resource allocation, such as
achieving higher bandwidth and lower latency. However, even with perfect routing
and ï¬ow control, situations remain in which the requests for a particular resource
will exceed its capacity. In this regime, our attention shifts from efï¬ciently allocating
the resource to fairly allocating the resource according to to some service policies.
In this chapter, we focus on both the typical services requested by network clients
and the mechanisms for providing these services. Broadly speaking, we refer to these
topics as providing QoS.
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