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A group of switch schedulers make packet scheduling decisions based on predefined bandwidth allocation for each flow. Allocating bandwidth for best effort flows is challenging due to lack of allocation criteria and fairness principles. In this paper, the authors propose sequential and parallel algorithms to allocate bandwidth for best effort flows in a switch, to achieve fairness and efficiency. The proposed algorithms use the queue length proportional allocation criterion, which allocates bandwidth to a best effort flow proportional to its queue length, giving more bandwidth to congested flows. In addition, the algorithms adopt the max-min fairness principle, which maximizes bandwidth utilization and maintains fairness among flows.
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