CONTROL OF PRE-FETCH TRAFFIC

摘要

Methods and systems for improved control of traffic generated by a processor are described. In an embodiment, when a device generates a pre-fetch request for a piece of data or an instruction from a memory hierarchy, the device includes a pre-fetch identifier in the request. This identifier flags the request as a pre-fetch request rather than a non-pre-fetch request, such as a time-critical request. Based on this identifier, the memory hierarchy can then issue an abort response at times of high traffic which suppresses the pre-fetch traffic, as the pre-fetch traffic is not fulfilled by the memory hierarchy. On receipt of an abort response, the device deletes at least a part of any record of the pre-fetch request and if the data/instruction is later required, a new request is issued at a higher priority than the original pre-fetch request.

主权项

1. A method of controlling traffic generated by a processor, the method comprising:
attaching, at the processor, a pre-fetch identifier to a pre-fetch request to flag the pre-fetch request as a pre-fetch request, rather than a non-pre-fetch request, the pre-fetch request requesting an item from a memory hierarchy, wherein the item comprises a piece of data or an instruction; transmitting the pre-fetch request from the processor to the memory hierarchy; and in response to receiving, at the processor, an abort response, corresponding to the pre-fetch request, generated by a node of the memory hierarchy based on the pre-fetch identifier, removing at least a portion of data stored locally to the processor relating to the pre-fetch request.