Importance

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Abstract

Methods and apparatus that may be utilized to maintain coherency of data accessed by both a processor and a remote device are provided. The remote device may include coherency logic, referred to herein as a snoop filter, designed to filter memory access requests that do not require bus commands to be sent to the processor. The snoop filter may filter requests based on a remote cache directory designed to mirror the processor cache directory, such that only those requests that target cache lines indicated to be valid in the processor cache result in snoop commands sent to the processor. Other requests (targeting data that is not cached in the processor) may be routed directly to memory without the latency conventionally associated with snoop requests.

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First Claim