Zeb Hering 56ae7542a2 Hold fan speed unless the change is worth making ...

The setpoint was a continuous function of instantaneous temperature and
was pushed to the BMC every pass, so ~1% of fan per degree of CPU noise
meant the fans never settled. Measured on iz-pve0: stock iDRAC held one
speed for 5 minutes through 57-59c jitter while this script made 7
changes in 16 minutes off the same signal.

Adds a 5% deadband around the applied speed, with full-speed requests
never held back and a periodic re-assert in case the BMC forgets.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

2026-08-28 20:07:33 -07:00

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