Intel Corporation

Hewlett-packard Development Company, L.p.

Vincent R Freytag

Ganesh Kumar

Dheemanth Nagaraj

Gregory S Averill

Eric R Delano

Eric R DeLano

Methods and apparatus relating to memory mirroring and migration at a Home Agent (HA) are described. In one embodiment, a home agent may mirror its data at a slave agent. In some embodiments, a bit in a directory may indicate status of cache lines. Other embodiments are also disclosed.

Memory mirroring and migration at home agent

In one embodiment, a method includes receiving a read request from a first caching agent and if a directory entry associated with the request is in an unknown state, an invalidating snoop message is sent to at least one other caching agent to invalidate information in a cache location of the other caching agent corresponding to the location of the read request, to enable setting of the directory entry into a known state. Other embodiments are described and claimed.

Controllably exiting an unknown state of a cache coherency directory

Methods and apparatus relating to home agent data and memory management are described. In one embodiment, a scrubber logic corrects an error at a location in a memory corresponding to a target address by writing back the corrected version of data to the target location. In an embodiment, a map out logic maps out an index or way of a directory cache in response to a number of errors, corresponding to the directory cache, exceeding a threshold value. Other embodiments are also disclosed.

Home agent data and memory management

In a bus interface adapted for usage in a multiple-core processor, an interface couples a bus to the one or more processor cores. The bus interface comprises a queue coupled to the interface which is adapted to receive snoop responses from the processor cores and coalesce snoop responses from the processor cores into a single snoop response that reflects snoop responses from all processor cores.

Growing community of inventors

Windsor, CO, United States of America

Vincent R Freytag