Method and apparatus for filtering memory write snoop activity in a distributed shared memory computer

Abstract

A method and apparatus for filtering memory probe activity for writes in a distributed shared memory computer. In one embodiment, the method may include initiating a first store operation to a cache data block stored in a first cache from a first processing node including the first cache and assigning a modified cache state to the cache data block in response to initiating the first store operation. The method may further include evicting the cache data block from the first cache subsequent to initiating the first store operation, storing the cache data block in a remote cache in response to the evicting, and assigning a remote directory state to a coherence directory entry corresponding to the cache data block in response to storing the cache data block in the remote cache, where the remote directory state is distinct from an invalid directory state.