tuned-amdgpu

Hacky solution to integrate AMDGPU power/clock control into tuned profiles with Ansible.

Extends every tuned profile found in /usr/lib/tuned using the AMDGPU hwmon interfaces:

• default: the out-of-the-box GPU clock/power configuration
• overclock: the optimized card configuration. Includes the clock/voltage/power settings outlined below.
• peak: the same as overclock, but with clock gating removed. May help profiling.

Contrary to the name, the overclock profiles can be used to de-tune the card as well.

Warning: This is only tested with RX6000 series GPUs, others may not work properly. Use at your own risk!

Assumptions / Limitations

Multiple GPUs in a single system are not yet supported. This role assumes management over a single GPU with displays attached.

Profiles

Two 'profiles' are in each name:

• before amdgpu is the source profile provided with tuned
• after amdgpu tells the GPU clock profile offered, outlined below

Output profile	Description
balanced-amdgpu-default	Includes the (assumed) existing balanced tuned profile. Only adjusts the GPU power limit (typically lower). Clocks/voltage curve remain the default.
desktop-amdgpu-overclock	Includes the (assumed) existing desktop tuned profile. Adjusts the GPU power limit, clocks, and the voltage curve.
desktop-amdgpu-peak	Includes the (assumed) existing desktop tuned profile. Same as the overclock profile, but locks clocks to their highest configured values

Config

The playbook will render/make effective this config file: /etc/tuned/amdgpu-profile-vars.conf

Here is a preview:

tuned_amdgpu_clock_min=500
tuned_amdgpu_clock_max=2715
tuned_amdgpu_memclock_static=1075
tuned_amdgpu_power_multi_def=0.869969040247678
tuned_amdgpu_power_multi_oc=1.0
tuned_amdgpu_mv_offset=+60

These are the result of Variables below; changes outside of Ansible are not immediately effective. Switching tuned profiles or restarting the service would be required.

One can use gamemode for dynamic switching. Sample ~/.config/gamemode.ini below:

[custom]
start=tuned-adm profile latency-performance-amdgpu-overclock
end=tuned-adm profile latency-performance-amdgpu-default

See this Arch Wiki link for more comprehensive information.

Variables

These are the variables you'll want to change/consider.

Variable	Description
tuned_amdgpu_clock_min	Mininum GPU clock (in Mhz) for overclock and peak profiles
tuned_amdgpu_clock_max	Maximum GPU clock (in MHz) for overclock and peak profiles
tuned_amdgpu_mv_offset	GPU voltage offset. Takes +/- some integer in millivolts to raise or lower. eg: -25 for 0.025V undervolt.
tuned_amdgpu_power_multi_def	Float between 0.0 (none) and 1.0 (full); effective power limit relative to board capability. For the default profiles
tuned_amdgpu_power_multi_oc	Instance of tuned_amdgpu_power_multi_def for overclock and peak profiles
tuned_amdgpu_memclock_static	Static memory clock (in MHz) for overclock and peak profiles. Not the effective data rate (multiplied by generation), but the actual clock. Static assignment avoids potential display flickering.