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    • 1. 发明授权
    • System and method for improving multilevel cache performance in a
multiprocessing system
    • 用于提高多处理系统中多级缓存性能的系统和方法
    • US5623632A
    • 1997-04-22
    • US442740
    • 1995-05-17
    • Peichun P. LiuMichael J. MayfieldRobert J. Reese
    • Peichun P. LiuMichael J. MayfieldRobert J. Reese
    • G06F12/08
    • G06F12/0811
    • In a multiprocessor system having a plurality of bus devices coupled to a storage device via a bus, wherein the plurality of bus devices have a snoop capability, and wherein the plurality of bus devices have first and second caches, and wherein the plurality of bus devices utilize a modified MESI data coherency protocol, the system provides for reading of a data portion from the storage device into one of the plurality of bus devices, wherein the first cache associated with the one of the plurality of bus devices associates a special exclusive state with the data portion, and wherein the second cache associated with the one of the plurality of bus devices associates an exclusive state with the data portion, initiating, by the one of the plurality of bus devices, a write-back operation with respect to the data portion, determining if there are any pending snoops in the second cache, and changing the special exclusive state to a modified state if there are no pending snoops in the second cache. If there is a pending snoop in the second cache, a comparing of addresses of the pending snoop and the data portion is performed. The special exclusive state is changed to a modified state if the addresses are different. The special exclusive state indicates that a data portion is held in the primary cache in a shared state and that the data portion is held in the secondary in an exclusive state.
    • 在具有经由总线耦合到存储设备的多个总线设备的多处理器系统中,其中所述多个总线设备具有窥探能力,并且其中所述多个总线设备具有第一和第二高速缓存,并且其中所述多个总线设备 利用经修改的MESI数据一致性协议,系统提供将数据部分从存储设备读取到多个总线设备之一中,其中与多个总线设备之一相关联的第一高速缓存将专用独占状态与 所述数据部分,并且其中与所述多个总线设备中的所述一个总线设备相关联的所述第二高速缓存器将所述独占状态与所述数据部分相关联,由所述多个总线设备中的一个总线设备启动相对于所述数据的回写操作 部分,确定在第二高速缓存中是否存在任何未决的窥探,以及如果在第二高速缓存中没有未决的窥探,则将特殊排他状态改变为修改状态 缓存。 如果在第二高速缓存中存在待处理的窥探,则执行等待侦听和数据部分的地址的比较。 如果地址不同,则特殊排他状态将更改为修改状态。 特殊排他状态表示在共享状态下将数据部分保存在一级高速缓存中,并且数据部分以独占状态保存在次级中。