Hewlett-packard Company

Eric W Hamilton

Michael L Ziegler

William R Bryg

Robert J Brooks

Stephen G Burger

Brendan A Voge

K Monroe Bridges

Helen Nusbaum

A computing system is presented which includes a memory, an input/output adapter and a processor. The processor includes a write back cache in which dirty data may be stored. When performing a coherent write from the input/output adapter to the memory, a block of data is written from the input/output adapter to a memory location within the memory. The block of data contains less data than a full cache line in the write back cache. The write back cache is searched to determine whether the write back cache contains data for the memory location. When the search determines that the write back cache contains data for the memory location a full cache line which contains the data for the memory location is purged.

Partial cache line write transactions in a computing system with a write

A computing system includes a main memory and an input/output adapter. The input/output adapter accesses a translation map. The translation map maps input/output page numbers to memory address page numbers. Entries to the translation map are generated so that each entry includes an address of a data page in the main memory and transaction configuration information. The transaction configuration information is utilized by the input/output adapter during data transactions to and from the data page.

Access hints for input/output address translation mechanisms

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Mountain View, CA, United States of America

Eric W Hamilton