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Add dynamic minimum fan speed support#9

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Junchao-Mellanox wants to merge 21 commits intomasterJunchao-Mellanox/sonic-buildimage:masterfrom dy-min-speedJunchao-Mellanox/sonic-buildimage:dy-min-speedCopy head branch name to clipboard

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Commits on Mar 11, 2020

• [thermal control] Fix pmon docker stop issue on 3800

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• [thermal fix] Fix QA test issue

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• Fix thermal control issues

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• [thermal fix] change psu._get_power_available_status to psu.get_power_available_status

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• [thermal fix] adjust log for PSU absence and power absence

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• [thermal fix] add unit test for loading thermal policy file with duplicate conditions in different policies

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• [thermal] fix fan.get_presence for non-removable SKU

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• [thermal fix] fix issue: fan direction is based on drawer

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• Fix issue: when fan is not present, should not read fan direction from sysfs but directly return N/A

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• [thermal fix] add unit test for get_direction for absent FAN

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Commits on Mar 16, 2020

• Unplugable PSU has no FAN, no need add a FAN object for this PSU

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Commits on Mar 18, 2020

• 1. Enable thermal alogrithm by default; 2. set cooling level before set speed; 3. check thermal zone temperature before set speed; 4. enable thermal algorithm by change thermal_zone_mode

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• start thermal algorithm should also check thermal zone temperature

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Commits on Mar 19, 2020

• Should write string to file

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• We should force enable or disable thermal algo when thermal control daemon start up

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• Change thermal algorithm status should also change thermal zone policy

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Commits on Mar 26, 2020

• Merge remote-tracking branch 'origin/master' into thermal-algo-fix

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• Add fan speed dynamic minimum value

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• Add unit test for DynamicMinCoolingLevelPolicy

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Commits on Mar 27, 2020

• If current cooling state below minimum cooling state, set it to minimum cooling state

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Commits on Apr 7, 2020

• Fix review comment by Kebo

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