ACCELERATED RECOVERY FOR SNOOPED ADDRESSES IN A COHERENT ATTACHED PROCESSOR PROXY

A coherent attached processor proxy (CAPP) that participates in coherence communication in a primary coherent system on behalf of an external attached processor maintains, in each of a plurality of entries of a CAPP directory, information regarding a respective associated cache line of data from the...

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Bibliographic Details
Main Authors STUECHELI JEFF A, CUMMINGS DAVID W, SIEGEL MICHAEL S, BLANER BARTHOLOMEW, DALY, JR. GEORGE W
Format Patent
LanguageEnglish
Published 17.07.2014
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:A coherent attached processor proxy (CAPP) that participates in coherence communication in a primary coherent system on behalf of an external attached processor maintains, in each of a plurality of entries of a CAPP directory, information regarding a respective associated cache line of data from the primary coherent system cached by the attached processor. In response to initiation of recovery operations, the CAPP transmits, in a generally sequential order with respect to the CAPP directory, multiple memory access requests indicating an error for addresses indicated by the plurality of entries. In response to a snooped memory access request that targets a particular address hitting in the CAPP directory during the transmitting, the CAPP performs a coherence recovery operation for the particular address prior to a time indicated by the generally sequential order.
Bibliography:Application Number: US201313739770