Data storage system with performance-based distribution of I/O requests to processing cores
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United States of America Patent
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Jun 29, 2021
Grant Date -
Nov 5, 2020
app pub date -
Apr 30, 2019
filing date -
Apr 30, 2019
priority date (Note) -
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Abstract
A method of assigning I/O requests to CPU cores of a data storage system includes, in a first operating mode, assigning I/O requests to CPU cores based on port affinity while maintaining a current I/O completion count, and regularly performing a first test-and-switch operation that includes (i) for a sample interval, temporarily assigning the I/O requests to the CPU cores based on core availability while obtaining a sample I/O completion count, (ii) comparing the first sample I/O completion count to the current I/O completion count, and (iii) based on the sample I/O completion count being greater than the current I/O completion count, switching to a second operating mode. In the second operating mode, I/O requests are assigned to the CPU cores based on core availability, and similar operations are performed for periodically testing whether to switch to the first operating mode.
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