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Method, Apparatus, System and Program Product Supporting Directory-Assisted Speculative Snoop Probe With Concurrent Memory Access
Method, Apparatus, System and Program Product Supporting Directory-Assisted Speculative Snoop Probe With Concurrent Memory Access
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机译:支持并发存储器访问的目录辅助推测探听探针的方法,装置,系统和程序产品
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摘要
A multiprocessor data processing system includes a memory controller controlling access to a memory subsystem, multiple processor buses coupled to the memory controller, and at least one of multiple processors coupled to each processor bus. In response to receiving a first read request of a first processor via a first processor bus, the memory controller initiates a speculative access to the memory subsystem and a lookup of the target address in a central coherence directory. In response to the central coherence directory indicating that a copy of the target memory block is cached by a second processor, the memory controller transmits a second read request for the target address on a second processor bus. In response to receiving a clean snoop response to the second read request, the memory controller provides to the first processor the target memory block retrieved from the memory subsystem by the speculative access.
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