摘要:
A system may comprise a first node that includes an ordering point for data, the first node being operative to employ a write-back transaction associated with writing the data back to memory. The first node broadcasts a write-back message to at least one other node in the system in response to an acknowledgement provided by the memory indicating that the ordering point for the data has migrated from the first node to the memory.
摘要:
Systems and methods are disclosed for interaction between different cache coherency protocols. One system may comprise a home node that receives a request for data from a first node in a first cache coherency protocol. A second node provides a conflict response to a request for the data from the home node. The conflict response indicates that an ordering point for the data is migrating according to a second cache coherency protocol, which is different from the first cache coherency protocol.
摘要:
One disclosed embodiment is a multi-processor system comprising a processor having a processor pipeline that executes program instructions with data from a speculative fill that is provided in response to a source request. The multi-processor system can further comprise a non-retired store cache that retains non-retired store data based on program instructions to store data into a data cache associated with the processor. The non-retired store data can be written to the data cache if data of a speculative fill associated with the non-retired store data is determined to be coherent. Other apparatus and methodologies are disclosed.
摘要:
Multiprocessor systems and methods are disclosed. One embodiment may comprise a plurality of processor cores. A given processor core may be operative to generate a request for desired data in response to a cache miss at a local cache. A shared cache structure may provide at least one speculative data fill and a coherent data fill of the desired data to at least one of the plurality of processor cores in response to a request from the at least one processor core. A processor scoreboard arbitrates the requests for the desired data. A speculative data fill of the desired data is provided to the at least one processor core. The coherent data fill of the desired data may be provided to the at least one processor core in a determined order.
摘要:
A system includes a first node that broadcasts a request for data. A second node having a first state associated with the data defines the second node as an ordering point for the data. The second node provides a response to the first node that transfers the ordering point to the first node in response to the request for the data.
摘要:
Systems and methods are disclosed for blocking data responses. One system includes a target node that, in response to a source broadcast request for requested data, provides a response that includes a copy of the requested data. The target node also provides a blocking message to a home node associated with the requested data. The blocking message being operative cause the home node to provide a non-data response to the source broadcast request if the blocking message is matched with the source broadcast request at the home node.
摘要:
A system comprises a first node including data having an associated state. The associated state of the data at the first node is a modified state. The system also comprises a second node operative to provide a non-migratory source broadcast request for the data. The first node is operative in response to the non-migratory source broadcast request to provide the data to the second node and to transition the associated state of the data at the first node from the modified state to an owner state without updating memory. The second node is operative to receive the data from the first node and assign a shared state to an associated state of the data at the second node.
摘要:
A system comprises a first node having an associated cache including data having an associated first cache state. The first cache state is capable of identifying the first node as being an ordering point for serializing requests from other nodes for the data.
摘要:
Multi-processor systems and methods are disclosed that employ a pre-fetch buffer to provide data fills to a source processor in response to a request. A pre-fetch buffer retrieves data as a uncached data fill. The source processor processes the data in response to a source request.
摘要:
Systems and methods are disclosed for updating owner predictor structures. In one embodiment, a multi-processor system includes an owner predictor control that provides an ownership update message corresponding to a block of data to at least one of a plurality of owner predictors in response to a change in an ownership state of the block of data. The update message comprises an address tag associated with the block of data and an identification associated with an owner node of the block of data.