Buffer overflow management in QoS switches
STOC '01 Proceedings of the thirty-third annual ACM symposium on Theory of computing
Nearly optimal FIFO buffer management for DiffServ
Proceedings of the twenty-first annual symposium on Principles of distributed computing
Competitive queueing policies for QoS switches
SODA '03 Proceedings of the fourteenth annual ACM-SIAM symposium on Discrete algorithms
Dynamic routing on networks with fixed-size buffers
SODA '03 Proceedings of the fourteenth annual ACM-SIAM symposium on Discrete algorithms
Scheduling policies for CIOQ switches
Proceedings of the fifteenth annual ACM symposium on Parallel algorithms and architectures
Universal stability results for greedy contention-resolution protocols
FOCS '96 Proceedings of the 37th Annual Symposium on Foundations of Computer Science
The zero-one principle for switching networks
STOC '04 Proceedings of the thirty-sixth annual ACM symposium on Theory of computing
Rate vs. buffer size: greedy information gathering on the line
Proceedings of the nineteenth annual ACM symposium on Parallel algorithms and architectures
Approximation algorithms for time-constrained scheduling on line networks
Proceedings of the twenty-first annual symposium on Parallelism in algorithms and architectures
A survey of buffer management policies for packet switches
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The combination of the buffer sizes of routers deployed in the Internet, and the Internet traffic itself, leads routinely to the dropping of packets. Motivated by this, we are interested in the problem of maximizing the throughput of protocols that control packet networks. Moreover, we are interested in a setting where different packets have different priorities (or weights), thus taking into account Quality-of-Service considerations.We first extend the Competitive Network Throughput (CNT) model introduced by Aiello et al. [2] to the weighted packets case. We analyze the performance of online, local-control protocols by their competitive ratio, in the face of arbitrary traffic, using as a measure the total weight of the packets that arrive to their destinations, rather than being dropped en-route. We prove that on directed acyclic graphs (DAGs), any greedy protocol is competitive, with competitive ratio independent of the weights of the packets. We give two independent upper bounds on the competitive ratio of general greedy protocols on DAGs. We further give lower bounds that show that our upper bounds cannot be improved (other than constant factors) in the general case. Both our upper and lower bounds apply also to the unweighted case, and they improve the results given in [2] for that case. We thus give tight (up to constant factors) upper and lower bounds for both the unweighted and weighted cases.In the course of proving our upper bounds we prove a lemma that gives upper bounds on the delivery times of packets by any greedy protocol on general DAGs (without buffer size considerations). We believe that this lemma may be of independent interest and may find additional applications.