linux/Documentation/block/kyber-iosched.rst

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Kyber I/O scheduler tunables
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The only two tunables for the Kyber scheduler are the target latencies for
reads and synchronous writes. Kyber will throttle requests in order to meet
these target latencies.

read_lat_nsec
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Target latency for reads (in nanoseconds).

write_lat_nsec
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Target latency for synchronous writes (in nanoseconds).