provide a multiplier to reduce AMDGPU power cap

playbook.yml

@@ -2,6 +2,10 @@
 - hosts: localhost
   become: yes
   vars:
+    power_max_multi: 0.90 # should not exceed 1.0, must be a float. note: driver seems to do its own rounding
+    power_max: "{{ power_max_b64['content'] | b64decode }}"
+    power_cap_float: "{{ power_max |float * power_max_multi }}"
+    power_cap: "{{ power_cap_float |int }}"
     card: card0 # default to card0
     base_profiles: # standard tuned profiles available on Fedora, should dynamically discover?
       - balanced
@@ -37,7 +41,7 @@
     - name: get max power capability for {{ card }}
       slurp:
         src: "{{ hwmon.files.0.path }}"
-      register: power_max
+      register: power_max_b64
     - name: ensure tuned is installed
       package:
         name: tuned

templates/tuned.conf.j2

@@ -5,7 +5,8 @@ summary={{ item.1 }} + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = {{ item.
 [sysfs]
 /sys/class/drm/{{ card }}/device/power_dpm_force_performance_level = manual
 /sys/class/drm/{{ card }}/device/pp_power_profile_mode = {{ item.0.value }}
-/sys/class/drm/{{ card }}/device/hwmon/hwmon9/power1_cap = {{ power_max['content'] | b64decode }}
+# limit to {{ power_max_multi * 100.0 |int }}% of the max power cap, nearest (higher) whole number
+/sys/class/drm/{{ card }}/device/hwmon/hwmon9/power1_cap = {{ power_cap }}
 
 [sysctl]
 net.core.default_qdisc=fq