【作者】 杨俊；

【导师】 曾华燊；

【作者基本信息】 西南交通大学 ， 计算机应用技术， 2006， 硕士

【摘要】 本项研究工作的背景是:四川省网络通信技术重点实验室对下一代Internet体系结构的研究——“单物理层用户数据传输与交换平台”(SUPA-Single User-data transfer & switching Platform Architecture)及其核心交换技术——“面向以太网的物理帧时槽交换”(EPFTS-Ethernet-oriented Physical Frame Timeslot Switching)。实现SUPA和EPFTS的关键是研究能够适应多端口高速交换需要的、能够保障服务质量需要的交换结构与交换技术。本论文的研究题目——基于存储共享的NISO-MEFS(NISO-MEFS-N-Input-Single-Output Multiplexed Express Forwarding Structure)研究,就是研究存储器的访问控制机制和方法,设计出能够适应NISO-MEFS需要的存储方案,探讨用局部共享存储方式实现NISO-MEFS新型交换结构的方案与技术。 笔者的贡献在于: (1)在分析典型交换机结构和各种队列模型的基础上,重点分析了采用局部共享存储方式在EPFTS交换机中的潜在应用前景。 (2)针对EPFTS的需要,分析了解决高速交换机需要的共享存储技术;通过计算,设计了能用于EPFTS交换机的局部共享存储器的基本方案。 (3)在存储器的管理调度方式上,通过三类传统的管理模式(完全分割、完全共享和部分共享)的仿真实验,分析了各种方法的利弊,最后提出了一种“最小分配空间与部分共享相结合的存储分配管理方案”(MMA-PMS-Minimal Memory-space Assignment Combined Partial Memory Sharing)。进一步的仿真实验表明该方案在重负载条件下,对数据流的不同突发强度与分布,该方案对最高优先级别的业务能始终保持较低的数据丢失率。这对于EPFTS中基于优先级别的服务保障机制提供了一种较优的可选方案。 (4)以实验室提出的NISO-MEFS结构为背景,利用上述结果提出了实现该结构的初步方案,并初步论述其可行性。更多还原

【Abstract】 The background of this dissertation is the research work aiming for Next Generation Internet, i.e. SUPA (Single User-data transfer & switching Platform Architecture) and its core switching technique EPFTS (Ethernet-oriented Physical Frame Timeslot Switching), carried out at Sichuan Network Communication Key Laboratory (SC-Netcom Lab). The key of realization of SUPA and EPFTS lies in switching techniques and switch fabric, which are suitable for high-speed switching in multi-port switches and capable of providing required Quality of Service (QoS). The work related to "shared-memory based NISO-MEFS" presented in this dissertation aims at possible techniques in memory management so as to realize the N-Input- Single-Output Multiplexed Express Forwarding Structure (NISO-MEFS) based shared memory approach.The contribution of the author presented in this dissertation can be summarized as:A. Explored the potential prospect to apply shared memory approach in EPFTS based on typical switch fabric and queuing models.B. Presented a design for high-speed EPFTS switches with shared-memory approach through analysis of shared-memory techniques in the perspective of EPFTS requirement.C. Introduced a new memory management scheme called MMA-PMS (Minimal Memory-space Assignment Combined Partial Memory Sharing) , which ensures that data loss rate for traffic with the highest priority can be as low as possible with different bursting pattern even at heavy load condition. Simulation results of typical memory management schemes (Complete partitioning, fully sharing, and partial sharing) and MMA-PMS have shown the priority of MMA-PMS scheme over existing ones. This scheme has provided a favorable technique for EPFTS switches, where QoS provisioning is based on priorities.D. Proposed a framework for NISO-MEFS with shared memory approach with the results above and verified its operability to some extent.更多还原