【作者】 朱园园；

【导师】 吴国新；

【作者基本信息】 东南大学 ， 计算机系统结构， 2005， 硕士

【摘要】 随着Internet和网络技术的不断发展,一种新的工作方式---计算机支持的协同工作(CSCW)应运而生。与此同时计算机支持的协同设计(CSCD)作为CSCW系统的一个主要应用,受到了越来越多地重视。P2P称为点到点技术,在该模式下每个节点的地位都是相同的,既可以从别的节点处获取服务,同时也可以向其它节点提供服务。正是由于P2P模式具有这种所有节点是对等的并且协同完成任务的特征,所以利用P2P模式实现协同设计系统便成为一种很自然的选择。在P2P模式的协同设计环境中,协同用户之间传递的数据不再仅仅局限于文本类型,更多时候传递的是那些具有实时性要求的数据流(如音频和视频数据);同一协同组内的各用户所拥有的网络环境和用户需求也具有很大差异。诸如此类的问题,使得目前IP网络所能提供的单一服务---尽力而为服务已很难满足实际需要,因此迫切希望能在现有的传输机制的基础上增加一定的QoS(quality of service)机制,以满足各类用户对传输服务质量的不同需求。本文首先简单介绍P2P网络和CSCW系统,并着重分析其对QoS的需求。接着对现有的两个QoS体系结构IntServ模型和DiffServ模型进行阐述,说明它们的工作原理并对二者进行一定的比较。第三部分则是研究Linux中的QoS机制,着重介绍Linux中的流量控制机制(Traffic Control,简称TC)。通过对上述相关理论的研究和分析,论文给出了基于P2P模式的协同设计环境中QoS系统总体设计方案,并对相关模块的实现做了具体的描述。最后,论文总结了研究内容和成果,并根据不足之处提出对未来工作的展望。更多还原

【Abstract】 Along with Internet and network technology developing rapidly,a new working method---CSCW has appeared.At the same time,Computer Supported Cooperative Design(CSCD for short),one of main applications of CSCW,gets more and more attention.P2P technology also can be called point-to-point technology.In P2P model each node has the same role: it can get service from other nodes and can supply service to other nodes synchronously.Because P2P model has the characteristic---all nodes are the same and can fulfill tasks cooperatively,the P2P model becomes a natural choose for the CSCD system.In the CSCD system based on P2P model,which type of data can be transmitted between users is not only text,but mostly is real-time stream such as video or audio;Each user in the same cooperative group may has different environment.All these problems such as the above mentioned,make the best-effort transmission service, the only service type which current network has, can not satisfy the actual applications’needs. Some QoS(quality of service) mechanism should be added into current transmission system in order to satisfy different users’needs.The thesis firstly introduces P2P network and CSCW system ,analyzing their QoS needs.Secondly the thesis describes the mainly QoS models—IntServ and DiffServ,giving their principles and differences.After that,the thesis mainly researches the QoS mechanism in the Linux System,specially the traffic control technology(TC for short).In according to the related theory researches and analysises,the thesis puts forwards the overall project of implementing QoS prototype system based on the the CSCD system using P2P model,then giving an detailed sub-system design. At last, the paper discusses the conclusion and future works.更多还原