Host adapter for combining I/O completion reports and method of using the same
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United States of America Patent
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Aug 13, 2002
Issued Date -
N/A
app pub date -
Mar 31, 1999
filing date -
Mar 31, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
An input/output (I/O) controller in an I/O system processes I/O requests from a host computer to a plurality of I/O devices. The I/O controller generates an interrupt to the host computer and reports a plurality of completed I/O requests from the I/O devices when at least one condition of the I/O system is met. A first condition of the I/O system comprises a predetermined ratio between the total number of unreported I/O completions by the I/O devices and the total number of remaining I/O requests from the host computer. A second condition comprises the expiration of a timer, which starts when the number of remaining I/O requests left to process for any individual I/O device reaches a predetermined minimum limit.
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