- Why I did it
Optimize thermal control policies to simplify the logic and add more protection code in policies to make sure it works even if kernel algorithm does not work.
- How I did it
Reduce unused thermal policies
Add timely ASIC temperature check in thermal policy to make sure ASIC temperature and fan speed is coordinated
Minimum allowed fan speed now is calculated by max of the expected fan speed among all policies
Move some logic from fan.py to thermal.py to make it more readable
- How to verify it
1. Manual test
2. Regression
Backport #9258 to 201911
Why I did it
When PSU is powered off, the PSU is still on the switch and the air flow is still the same. In this case, it is not necessary to set FAN speed to 100%.
How I did it
When PSU is powered of, don't treat it as absent.
How to verify it
Adjust existing unit test case
Add new case in sonic-mgmt
Conflicts:
platform/mellanox/mlnx-platform-api/sonic_platform/thermal_infos.py
