Patent
1994-10-03
1997-04-22
Lee, Thomas C.
G06F 1300
Patent
active
056236948
ABSTRACT:
A data processing system includes one or more processing units, a memory subsystem, and one or more input/output channel controllers, wherein each of the input/output channel controllers include the capability of speculative input/output execution. The speculative I/O execution technique according to the present invention may include several options. The speculative execution in the IOCC begins after receiving a raw address even though the operation can still be remotely retried. The programmed I/O latency time is reduced significantly due to the early speculative commencement of the IOCC operation. The IOCC may have to abort the speculative operation if a remote flow control retry is received. If, however, no retry is received then significant time is saved because the speculative operation proceeds.
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Arimilli Ravi K.
Dodson John S.
Lewis Jerry D.
Chen Duo
International Business Machines - Corporation
Lee Thomas C.
LandOfFree
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