Abstract: A method for retransmitting data includes a transmitter receiving a retry request, where the retry request includes a sequence number of a first to-be-retransmitted flit. The transmitter reads data in a retry buffer based on the sequence number of the first to-be-retransmitted flit and retransmits the data, where the retry buffer includes flits of at least two types of data packets, and retransmission manners of the at least two types of data packets are different.

Abstract: A switching device is provided obtains information about devices connected to a plurality of ports of the switching device and determines response ports of the switching device based on the information about the devices connected to the plurality of ports. Different response ports of the switching device are connected to different devices, and each response port is configured to receive a management packet or a response to the management packet that is sent by a device connected to each response port in a device enumeration process.

Abstract: A directory maintenance method and apparatus are provided. The method includes sending, by a main memory according to a correspondence between a cache line in a directory and a cache, listening information to each cache corresponding to a cache line at a preset frequency; receiving, by each cache corresponding to the cache line, the listening information, and sending a listening response according to the listening information; and receiving, by the main memory, the listening response, and updating the directory according to the listening response, where the listening response includes a state of the cache line in the cache sending the listening response. The directory maintenance method and apparatus that are disclosed in the present invention can lower an impact of listening caused due to replacement on normal processing of a processor, and reduce degradation of system performance.

Abstract: The present disclosure provides a data read method and apparatus. An example method includes receiving a first read request message sent by a second processor at a first processor. If an address of the first data is within a range from an upper bound to a lower bound recorded in a first directory range register of the first processor, the first processor sends a first snoop message to at least one third processor other than the second processor, and simultaneously sends a second read request message to the memory. A first snoop response message sent by each of the at least one third processor according to the first snoop message is received. The first data sent by the memory according to the second data read request message is also received. The first processor sends the first data to the second processor according to the first snoop response message.

Abstract: The present invention disclose a memory access method, including: receiving, by a first processing module, a read request sent by a second processing module for caching; determining, according to a destination directory, one or more target storage spaces in which the target data is cached; sending a listening request to one or more target processing modules, so that the target processing module returns a listening response to the second processing module, where the listening response is used for responding to the expected status; returning a target packet to the second processing module, where the target packet includes the target data and a listening quantity; when a quantity of the listening response received by the second processing module matches the listening quantity, receiving an update packet sent by the second processing module; and updating the destination directory according to the update packet.

Abstract: The present invention provide a directory management method including: receiving, by a first NC, a first data access request sent by a first processor on a local node; if the first NC determines that a first directory does not include a directory entry corresponding to a first access address and the first directory does not include an idle directory entry, clearing, by the first NC, directory content of a directory entry from the first directory; writing, by the first NC, directory content corresponding to the first data access request to the cleared directory entry; and if the first NC determines that a first snoop request is received, sending, by the first NC, a first snoop message to the processor on the local node.

Abstract: A method for temporarily storing data and a storage device is provided. The method for temporarily storing data is applied to the storage device, and the storage device includes a source agent and a target agent. The method includes: sending, by the source agent, a data obtaining request to the target agent; receiving, by the source agent, target data that is corresponding to the data obtaining request and is returned by the target agent; determining, by the source agent, whether a snooping request that is for the target data and sent by the target agent is received after the data obtaining request is sent and before the target data is received, where the snooping request indicates that the target agent is simultaneously processing an obtaining request from another source agent for the target data; and if the snooping request is received, discarding, by the source agent, the target data.

Abstract: A method and an apparatus for processing a system command during memory backup. The method includes: acquiring a write address corresponding to a write operation command; if data corresponding to the write address has been read from a raw memory area but is not written to a backup memory area, mapping the write operation command to the raw memory area, and writing data to the write address in the raw memory area according to the write operation command; and deducting a set value from the write address to obtain an initial address to subsequently read data from the raw memory area. According to the embodiments of the present invention, a problem of system command blocking is solved during a memory backup operation, so that a system command is processed in a timely manner.

Abstract: A method for temporarily storing data and a storage device is provided. The method for temporarily storing data is applied to the storage device, and the storage device includes a source agent and a target agent.

Abstract: A directory maintenance method and apparatus are provided. The method includes sending, by a main memory according to a correspondence between a cache line in a directory and a cache, listening information to each cache corresponding to a cache line at a preset frequency; receiving, by each cache corresponding to the cache line, the listening information, and sending a listening response according to the listening information; and receiving, by the main memory, the listening response, and updating the directory according to the listening response, where the listening response includes a state of the cache line in the cache sending the listening response. The directory maintenance method and apparatus that are disclosed in the present invention can lower an impact of listening caused due to replacement on normal processing of a processor, and reduce degradation of system performance.

Abstract: A memory data access method and apparatus, and a system are provided. In the embodiments of the present invention, when it is determined, according to a preset rule, that memory data located on a remote node needs to be frequently accessed, the memory data located on the remote node is replicated to a memory of a local node, and then the memory data located on the remote node is accessed from the memory of the local node. Because a delay of accessing a memory of a processor in a local node is much less than a delay of accessing a memory of a remote processor, when memory data located on a remote node needs to be frequently accessed, a delay of reading the memory data located on the remote node may be significantly reduced by using the solution, thereby improving system performance.

Abstract: A method according to an embodiment of the present disclosure comprising: receiving a read instruction transmitted by a host device, the read instruction including a first address; reading first data together with a first CRC code and a first ECC which are associated with the first data from a memory based on the first address; and performing error detection on the first data based on the first CRC code, and performing error correction on the first data based on the first ECC if an error is detected. With the embodiments of the disclosure, the CRC code with better capability of error detection is adopted to perform error detection on the data. If any error is detected, error correction is performed using the ECC. Thus, it is possible to overcome the problem as to insufficient capability of error detection of the ECC in the prior art, thereby improving the system performance.

Abstract: A method and an apparatus for processing a system command during memory backup. The method includes: acquiring a write address corresponding to a write operation command; if data corresponding to the write address has been read from a raw memory area but is not written to a backup memory area, mapping the write operation command to the raw memory area, and writing data to the write address in the raw memory area according to the write operation command; and deducting a set value from the write address to obtain an initial address to subsequently read data from the raw memory area. According to the embodiments of the present invention, a problem of system command blocking is solved during a memory backup operation, so that a system command is processed in a timely manner.

Abstract: A method according to an embodiment of the present disclosure comprising: receiving a read instruction transmitted by a host device, the read instruction including a first address; reading first data together with a first CRC code and a first ECC which are associated with the first data from a memory based on the first address; and performing error detection on the first data based on the first CRC code, and performing error correction on the first data based on the first ECC if an error is detected. With the embodiments of the disclosure, the CRC code with better capability of error detection is adopted to perform error detection on the data. If any error is detected, error correction is performed using the ECC. Thus, it is possible to overcome the problem as to insufficient capability of error detection of the ECC in the prior art, thereby improving the system performance.