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    • 46. 发明授权
    • Method and apparatus for controlling congestion in a network node
    • 控制网络节点拥塞的方法和装置
    • US5867480A
    • 1999-02-02
    • US712683
    • 1996-09-12
    • Robert E. ThomasKoichi TanakaPeter J. RomanWing CheungShinichi Mizuguchi
    • Robert E. ThomasKoichi TanakaPeter J. RomanWing CheungShinichi Mizuguchi
    • H04L12/56G01R31/08G06F11/00G08C15/00
    • H04L12/5602H04L2012/5635H04L2012/5637H04L2012/5679
    • In a network node having a host system coupled to a network by an adapter, VC-specific congestion is detected and reported to the host system. The host memory includes rx slots or buffers, each corresponding to one of one or more supported slot types. Per-VC slots consumed counters are maintained to count slot consumption for each active VC. Free buffer FIFOs are maintained for each of the one or more slot types, which have a predetermined congestion threshold associated therewith. Entries in each free buffer FIFO correspond to an rx slot posted by the host system. When a new rx slot or buffer in host memory is to be allocated to an incoming cell received on a given VC, the slots consumed counter is compared to the predetermined congestion threshold. If they are equal, the VC is at threshold level and the incoming cell is discarded and a report is sent to the host system. If the slots consumed counter is below threshold, a new rx slot is allocated for the reception of the data and the slots consumed counter is incremented. If the VC is credit-based flow control enabled and the slots consumed counter is below threshold, a credit is returned. If the VC is credit-based flow control enabled and the slots consumed counter is greater than or equal to the threshold, the credit return is deferred until the counter falls below threshold.
    • 在具有通过适配器耦合到网络的主机系统的网络节点中,检测到VC特定的拥塞并将其报告给主机系统。 主机存储器包括rx时隙或缓冲器,每个对应于一个或多个支持的时隙类型之一。 维护每个VC槽消耗的计数器以计算每个活动VC的时隙消耗。 对于具有与其相关联的预定拥塞阈值的一个或多个时隙类型中的每一个,维持空闲缓冲器FIFO。 每个空闲缓冲区FIFO中的条目对应于由主机系统发布的rx时隙。 当将主机存储器中的新的rx时隙或缓冲区分配给在给定VC上接收到的传入小区时,将这些时隙消耗的计数器与预定拥塞阈值进行比较。 如果它们相等,则VC处于阈值级别,并且传入的信元被丢弃并且报告被发送到主机系统。 如果消耗的时隙计数器低于阈值,则为数据的接收分配一个新的rx时隙,并增加消耗的时隙计数器。 如果VC是启用了基于信用的流量控制,并且消耗的消费计数器低于阈值,则返回信用。 如果VC是启用了基于信用的流量控制,并且消费的时隙计数器大于或等于该阈值,那么信用回报被推迟到计数器低于阈值。