摘要
输入排队Crossbar交换是高性能交换设备最为常用而关键的技术之一.本文建立了IQ-Crossbar架构下的矩阵模型,给出了IQ-Crossbar的状态矩阵、队长矩阵、到达矩阵和匹配矩阵的数学定义,并通过分析IQ-Crossbar的信元排队机理,提出和证明了队长矩阵迭代定理和状态矩阵迭代定理.该矩阵模型为分析IQ-Crossbar架构下的调度算法提供了理论依据.基于所建立的矩阵模型,在分析现有LQF调度算法优缺点的基础上,本文提出了一种新的调度策略MM-LQF,该策略的运算效率是LQF的3.72倍,支持的端口门限速率是LQF的2.35倍,在贝努利均匀流量重载条件下平均时延是LQF的1/2;在贝努利Diagonal流量条件下吞吐率为100%.
The input-queued Crossbar Switching is one of the most popular and crucial technologies of the high-performance switching systems. The matrix model for IQ-Crossbar fabric is given in this paper, which has provided and well-defined the precise concepts of IQ-Crossbar fabric, such as the state matrix, the queueing length matrix, the arriving matrix, and the matching matliX. Based on analyzing the mechanism of the cell's queueing in the IQ-Crossbar, two matrix theorems of queueing length iteration as well as the state iteration are discussed and proved, The matrix model given in this paper provides the theoretical reference to IQ-Crossbar scheduling algorithms. Based on the matrix model set up in this paper and the analysis of the advantages and disadvantages of LQF algorithm, a new scheduling scheme of MM-LQF is provided, which has 3.72 times of operational efficiency,2.35 times of port gate rates,0.5 times of cell delay under heavy Bemoulli uniform load, 100% throughput under Bemoulli diagonal load of the LQF algorithm.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2008年第1期9-16,共8页
Acta Electronica Sinica
基金
国家863信息技术领域重大专项项目(No.2005AA121210)
国家973重点基础研究发展计划(No.2007CB307102)
关键词
输入排队交叉开关
矩阵模型
队长矩阵
调度策略
最长队列优先
input queued crossbar
matrix model
queueing length matrix
scheduling scheme
longest queue first