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d33931a83a
This is as much an upstream compatibility as it's a bit of a performance gain. The illumos taskq implemention doesn't allow a TASKQ_THREADS_CPU_PCT type to be dynamic and in fact enforces as much with an ASSERT. As to performance, if this taskq is dynamic, it can cause excessive contention on tq_lock as the threads are created and destroyed because it can see bursts of many thousands of tasks in a short time, particularly in heavy high-concurrency zvol write workloads. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Closes #5236 |
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