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    • 8. 发明授权
    • Snoop filter bypass
    • 窥探过滤器旁路
    • US07093079B2
    • 2006-08-15
    • US10323200
    • 2002-12-17
    • Tuan M. QuachLily Pao LooiKai Cheng
    • Tuan M. QuachLily Pao LooiKai Cheng
    • G06F12/08
    • G06F12/0831G06F12/082
    • Machine-readable media, methods, and apparatus are described for processing coherent requests of a computing device comprising multiple cache nodes. In some embodiments, a coherent switch may receive from a requesting cache node a coherent request for a line of memory. The coherent switch may further issue snoop requests to one or more non-requesting cache nodes based upon whether a snoop filter bypass mode is enabled. In particular, the coherent switch when not in snoop filter bypass mode may obtain coherency data from a snoop filter and may issue snoop requests to zero or more non-requesting cache nodes based upon the coherency data obtained from the snoop filter. Further, the coherent switch when in snoop filter bypass mode may bypass the snoop filter and may issue snoop requests to all non-requesting cache agents.
    • 描述了用于处理包括多个高速缓存节点的计算设备的相干请求的机器可读介质,方法和装置。 在一些实施例中,相干开关可以从请求的高速缓存节点接收对一行存储器的相干请求。 基于是否启用窥探过滤器旁路模式,相干交换机可以进一步向一个或多个非请求高速缓存节点发出窥探请求。 特别地,当不在窥探过滤器旁路模式时,相干开关可以从窥探过滤器获得一致性数据,并且可以基于从窥探过滤器获得的一致性数据向0个或更多个非请求缓存节点发出窥探请求。 此外,在窥探过滤器旁路模式中的相干交换机可以绕过窥探过滤器并且可以向所有不请求的缓存代理发出窥探请求。
    • 9. 发明授权
    • Method and device for gracious arbitration of access to a computer
system resource
    • 用于访问计算机系统资源的亲和仲裁的方法和装置
    • US5930486A
    • 1999-07-27
    • US707884
    • 1996-09-09
    • Lily Pao LooiNitin BorkarFrank Verhoorn
    • Lily Pao LooiNitin BorkarFrank Verhoorn
    • G06F13/364G06F13/362
    • G06F13/364
    • A computer system includes a priority arbitration scheme that prevents "hogging" of a bus by a priority agent. The computer system comprises at least one agent, at least one priority agent, a system resource, and a bus coupling the agent, priority agent, and system resource to one another. An arbiter is coupled to the bus, agent, and priority agent to receive request signals from the agent and the priority agent and to grant control of the bus to one of the agent and priority agent for access to the system resource. The priority agent is granted control of the bus whenever the priority agent asserts a request signal, as soon as the bus becomes next available. The priority agent relinquishes control of the bus to the agent, for a predetermined portion of the bus bandwidth, when a request signal is asserted by the agent.
    • 计算机系统包括优先权仲裁方案,其防止优先代理人对总线进行“占用”。 计算机系统包括至少一个代理,至少一个优先级代理,系统资源和将代理,优先级代理和系统资源彼此耦合的总线。 仲裁器耦合到总线,代理和优先级代理以从代理和优先级代理接收请求信号,并且将总线的控制权授予代理和优先级代理之一用于访问系统资源。 一旦总线变为下一个可用,优先权代理就会在优先权代理人断言一个请求信号时被控制总线。 当代理人断言请求信号时,优先权代理将总线的总线放弃到总线带宽的预定部分。