Queue depth management for communication between host and...

Details Queue depth management for communication between host and... Queue depth management for communication between host and...

2005-02-03

2009-10-27

Tsai, Henry W. H. (Department: 2184)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output access regulation

C710S039000

Reexamination Certificate

active

07610413

ABSTRACT:
Method for managing a queue in host memory for use with a peripheral device. Roughly described, the host makes a determination of the availability of space in the queue for writing new entries, in dependence upon historical knowledge of the number of queue entries that the host has authorized the device to write, and the number of entries that the host has consumed. In dependence on that determination, the host authorizes the device to write a limited number of new entries into the queue. The device writes entries into the queue dependence upon the number authorized. The host maintains a read pointer into the queue but does not need to maintain a write pointer, and the peripheral device maintains a write pointer into the queue but does not need to maintain a read pointer.

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