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Li "Integration of Unicast and Multicast Scheduling in Input-Queued Packet Switches with High Scalability",
- International Journal of Soft Computing and Software Engineering [JSCSE],
"... Abstract. This paper focuses on the scalability problems for high-speed switches, and presents an integrated scheduling algorithm that supports unicast and multicast traffic efficiently in input-queued packet switches. Considering the tradeoff balancing complexity and performance, the proposed inte ..."
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Abstract. This paper focuses on the scalability problems for high-speed switches, and presents an integrated scheduling algorithm that supports unicast and multicast traffic efficiently in input-queued packet switches. Considering the tradeoff balancing complexity and performance, the proposed integrated algorithm performs without iteration, and reduces the scheduling overhead to O(N) with a two-phase (request-grant) sequential scheduling for unicast and multicast traffic. In addition, it can be implemented in a fully distributed way, which is more suitable for high-speed switches. Simulation results show that the proposed algorithm exhibits a good performance in terms of throughput and average delay, at different traffic compositions under various traffic patterns.
Efficient multicast support in buffered crossbars using networks on chip
- in: Proc. IEEE Global Telecommunications Conference, 2009
"... Abstract-The Internet growth coupled with the variety of its services is creating an increasing need for multicast traffic support by backbone routers and packet switches. Recently, buffered crossbar (CICQ) switches have shown high potential in efficiently handling multicast traffic. However, they ..."
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Abstract-The Internet growth coupled with the variety of its services is creating an increasing need for multicast traffic support by backbone routers and packet switches. Recently, buffered crossbar (CICQ) switches have shown high potential in efficiently handling multicast traffic. However, they were unable to deliver optimal performance despite their expensive and complex crossbar fabric. This paper proposes an enhanced CICQ switching architecture suitable for multicast traffic. Instead of a dedicated internal crosspoint buffer for every input-output pair of ports, the crossbar is designed as a multi-hop Network on Chip (NoC). Designing the crossbar as a NoC offers several advantages such as low latency, internal fabric load balancing and path diversity. It also obviates the requirement of the virtual output queuing by allowing simple FIFO structure without performance degradation. We designed appropriate routing for the NoC as well as on-chip router scheduling and tested its performance under a wide range of input multicast traffic. Simulations results showed that our proposal outperforms the CICQ architecture and offers a viable architectural alternative. We also studied the effect of various parameters such as the depth of the NoC as well as the speedup requirement for high-bandwidth multicast switching.
