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    • 6. 发明授权
    • Method and system for guaranteeing quality of service in a multi-plane cell switch
    • 保证多平面单元开关中服务质量的方法和系统
    • US07292580B2
    • 2007-11-06
    • US10325700
    • 2002-12-18
    • Gopalakrishnan RamamurthyGopalakrishnan MeempatWilliam J. Dally
    • Gopalakrishnan RamamurthyGopalakrishnan MeempatWilliam J. Dally
    • H04L12/56
    • H04L12/5601H04L2012/5629H04L2012/5638H04L2012/5651H04L2012/5679H04L2012/5681
    • Data cells of plural classes are transferred from input ports to output ports through a switch by storing the cells at each input port in class-specific virtual output queues (VOQ) within sets of VOQs associated with output ports, and providing credits to VOQs according to class-associated guaranteed bandwidths. When a cell is received at a VOQ having credits, a high-priority request for transfer is generated. If a cell is received at a VOQ that does not have any available credits, a low-priority request for transfer is generated. In response to requests, grants are issued to VOQ sets without regard to class, high-priority requests being favored over low-priority requests. When a grant is received for a particular VOQ set, an arbitrator selects a VOQ from the set, giving priority to VOQs having credits over VOQs without credits, and a cell from the selected VOQ is transferred. Requests generated from all input ports are forwarded to a central scheduler associated with a switch fabric slice, the central scheduler issuing the grants. The switch fabric may comprise multiple slices and a central scheduler, across which requests may be distributed in parallel, for example, the switch fabric slices being selected in a fixed order. While all high-priority requests are granted, low priority requests may be granted by the central scheduler according to a weighted fair share policy.
    • 将多个类的数据单元通过交换机从输入端口传送到输出端口,通过将输出端口中的单元存储在与输出端口相关联的VOQ集合内的类特定虚拟输出队列(VOQ)中,并根据 类相关保证带宽。 当在具有信用的VOQ接收到信元时,产生高优先级的转移请求。 如果在没有任何可用信用的VOQ接收到信元,则生成低优先级的转移请求。 响应请求,向VOQ集发出授权,而不考虑低优先级请求的类别,优先级高的请求。 当针对特定VOQ集合接收到授权时,仲裁者从该集合中选择一个VOQ,优先考虑具有不带信用的VOQ的信用的VOQ,并且从所选择的VOQ中传送一个信元。 从所有输入端口产生的请求被转发到与交换机结构切片相关联的中央调度器,中央调度器发出授权。 交换结构可以包括多个片段和中央调度器,跨平台地分发请求,例如,以固定顺序选择交换结构片段。 当所有高优先级请求被授予时,中央调度器可以根据加权公平共享策略授予低优先级请求。