Command queuing for i/o adapters

Details Command queuing for i/o adapters Command queuing for i/o adapters

G - Physics

06

F

354/233

G06F 9/46 (2006.01) G06F 13/12 (2006.01)

Patent

CA 1119308

COMMAND QUEUING FOR I/O ADAPTERS Abstract In a computer system having: an addressable stor- age for storing instructions, data and input-output (I/O) commands; a central processing unit (CPU) which fetches and executes instructions; and channel means connecting I/O adapters to the storage and the CPU, an apparatus transfers I/O commands to the I/O adapters whereby the I/O command is either accepted immediately or is queued by the I/O adapter. A queued command is taken up by the I/O adapter when no other data transfer operation is pend- ing. To take up a queued command, the I/O adapter initiates a fetch of the pending command by invoking a standard data-transfer-from-storage sequence. The chan- nel means responds to the fetch initiated by the I/O adapter to send the pending command to the I/O adapter. RO9-78-020

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