Method for determining command execution dependencies within command queue reordering process
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United States of America Patent
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Aug 20, 1996
Grant Date -
N/A
app pub date -
Mar 28, 1994
filing date -
Mar 28, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A disk drive command queue reordering method includes calculation of least-latency and accounts for dependencies of I/O commands in the queue to avoid data hazards with respect to reordering of I/O commands. Command queue representation is augmented by a graph structure representing dependencies of queue commands. Computational overhead associated with constructing, maintaining, and executing graph flow analysis relative to the dependency graph is sufficiently low to allow interleaved operation with higher level disk drive functions such as timely interaction with the host device. The disclosure includes a method of calculating and maintaining the dependency information in a command queue and using this information to constrain command reordering in a time and computationally efficient manner.
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