A CBQ-Based Dynamic Resource Allocation Mechanism for Diffserv Routers
نویسندگان
چکیده
Class Based Queueing (CBQ) is a link-sharing and resource management mechanism for packet networks. The weights of CBQ control the way with which the available bandwidth at the output interface of the router is distributed among the different classes of the input traffic. CBQ also disposes of rules for bandwidth borrowing based on a hierarchy of classes. In [1], we proposed a dynamic, self-tuning mechanism for allocating resources in Diffserv routers called DRAM (Dynamic Resource Allocation Mechanism). The routers in [1] are supposed to implement a simple version of CBQ equivalent to Weighted Fair Queuing (WFQ), where the bandwidth borrowing feature of CBQ is disabled. DRAM tunes the weights of WFQ so that each class of traffic realizes its needs, and the resources of the network are efficiently utilized. The tuning is automatic, self-configurable, easy to deploy and to manage, without any additional signaling. In this paper, we study the impact of CBQ mechanisms related to bandwidth borrowing on the performance of DRAM. We show that the simultaneous use of DRAM and CBQ leads to better overall performance due to the bandwidth borrowing capabilities of CBQ; Service Level Agreement (SLA) profiles are more respected and network resources are better utilized than when DRAM is used with WFQ. The performance improvements are validated by a campaign of experiments on a real network testbed.
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