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On Tracking the Behavior of an Output-Queued Switch Using an Input-Queued Switch

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3 Author(s)
Gourgy, A. ; McMaster Univ., Hamilton, ON, Canada ; Szymanski, T.H. ; Down, D.G.

We address the problem of fair scheduling of packets in Internet routers with input-queued (IQ) switches and unity speedup. Scheduling in IQ switches is formulated as tracking the behavior of an output-queued (OQ) switch that provides optimal performance. We present the notion of ??lag?? as a performance metric that measures the difference between a packet's departure time in an IQ switch over that provided by an OQ switch. We prove that per-packet mean lag is bounded for a maximum weight-matching scheduling policy that uses lag values for its weights and derive a bound on the mean lag value using a Lyapunov function technique. Furthermore, we propose a simple heuristic tracking scheduling policy and evaluate its performance by simulation.

Published in:

Networking, IEEE/ACM Transactions on  (Volume:17 ,  Issue: 6 )

Date of Publication:

Dec. 2009

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