Dynamically assignable i/o controller cache

Details Dynamically assignable i/o controller cache Dynamically assignable i/o controller cache

G - Physics

06

F

354/237, 354/246

G06F 12/08 (2006.01) G06F 13/12 (2006.01)

Patent

CA 1176381

DYNAMICALLY ASSIGNABLE I/O CONTROLLER CACHE ABSTRACT In a data processing system of the type wherein a host processor transfers data to or from a plurality of attachment devices, a cache memory is provided for storing blocks of data which are most likely to be needed by the host processor in the near future. The host processor can then merely retrieve the necessary information from the cache memory without the neces- sity of accessing the attachment devices. When trans- ferring data to cache from an attachment disk, addi- tional unrequested information can be transferred at the same time if it is likely that this additional data will soon be requested. Further, a directory table is maintained wherein all data in cache is listed at a "home" position and, if more than one block of data in cache have the same home position, a conflict chaim is set-up so that checking the contents of the cache can be done simply and quickly.

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