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Multiprocessing system employing address switches to control mixed broadcast snooping and directory based coherency protocols transparent to active devices
Multiprocessing system employing address switches to control mixed broadcast snooping and directory based coherency protocols transparent to active devices
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机译:使用地址开关控制对活动设备透明的混合广播侦听和基于目录的一致性协议的多处理系统
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摘要
A multiprocessor computer system is configured to selectively transmit address transactions through an address network using either a broadcast mode or a point-to-point mode transparent to the active devices that initiate the transactions. Depending on the mode of transmission selected, either a directory-based coherency protocol or a broadcast snooping coherency protocol is implemented to maintain coherency within the system. A computing node is formed by a group of clients which share a common address and data network. The address network is configured to determine whether a particular transaction is to be conveyed in broadcast mode or point-to-point mode. In one embodiment, the address network includes a mode table with entries which are configurable to indicate transmission modes corresponding to different regions of the address space within the node. Upon receiving a coherence request transaction, the address network may then access the table in order to determine the transmission mode, broadcast or point-to-point, which corresponds to the received transaction.
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