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Packet-mode scheduling in input-queued cell-based switches

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5 Author(s)
Ajmone Marsan, M. ; Dipt. di Elettronica, Politecnico di Torino, Italy ; Bianco, A. ; Giaccone, P. ; Leonardi, E.
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We consider input-queued switch architectures dealing at their interfaces with variable-size packets, but internally operating on fixed-size cells. Packets are segmented into cells at input ports, transferred through the switching fabric, and reassembled at output ports. Cell transfers are controlled by a scheduling algorithm, which operates in packet-mode: all cells belonging to the same packet are transferred from inputs to outputs without interruption. We prove that input-queued switches using packet-mode scheduling can achieve 100% throughput, and we show by simulation that, depending on the packet size distribution, packet-mode scheduling may provide advantages over cell-mode scheduling.

Published in:

Networking, IEEE/ACM Transactions on  (Volume:10 ,  Issue: 5 )