Distributed Scheduling Algorithms for Crosspoint-Buffered Switches

TL;DR

This paper introduces DISQUO, a distributed scheduling algorithm for crosspoint-buffered switches that guarantees 100% throughput with minimal message passing and low complexity, addressing key challenges in high-speed network switching.

Contribution

The paper presents the first distributed 100% throughput scheduling algorithm for crosspoint buffered switches with limited message passing and low per-port complexity.

Findings

Achieves 100% throughput for Bernoulli traffic

Operates with low complexity of O(1) per port

Requires limited message passing

Abstract

Given the rapid increase in traffic, greater demands have been put on high-speed switching systems. Such systems have to simultaneously meet several constraints, e.g., high throughput, low delay and low complexity. This makes it challenging to design an efficient scheduling algorithm, and has consequently drawn considerable research interest. However, previous results either cannot provide a $100\%$ throughput guarantee without a speedup, or require a complex centralized scheduler. In this paper, we design a {\it distributed} $100 \%$ throughput algorithm for crosspoint buffered switches, called DISQUO, with very limited message passing. We prove that DISQUO can achieve $100\%$ throughput for any admissible Bernoulli traffic, with a low time complexity of $O(1)$ per port. To the best of our knowledge, it is the first distributed algorithm that can provide a $100\%$ throughput for a crosspoint buffered switch.