Adaptive bandwidth distribution system for high-performance input/output devices with variable throughput
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United States of America Patent
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Sep 21, 2010
Grant Date -
Oct 29, 2009
app pub date -
Jul 24, 2008
filing date -
Apr 23, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for issuing shadow requests to manage bandwidth allocation between an application that issues input/output (I/O) operation requests and an I/O device. A bandwidth manager detects the completion of an I/O operation, which includes either a read operation or a write operation. The bandwidth manager calculates a statistical duration for future I/O operations between the application and the I/O device based on throughput statistics related to past I/O operations. The bandwidth manager generates a shadow request for reserving a position in a queue that stores pending I/O requests for the I/O device for a first future I/O operation request from the application and having a duration related to the statistical duration, and inserts the shadow request into the queue. Advantageously, applications that do not make frequent I/O operation requests in advance may still execute I/O operations because bandwidth is reserved for future I/O operation requests via the shadow requests.
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