75 lines
3.5 KiB
Markdown
75 lines
3.5 KiB
Markdown
# tuned-amdgpu
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Hacky solution to integrate AMDGPU power/clock control into `tuned` profiles
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with Ansible.
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Extends every `tuned` profile found in `/usr/lib/tuned`
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using the [AMDGPU hwmon interfaces](https://docs.kernel.org/gpu/amdgpu/thermal.html):
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- `default`: the out-of-the-box GPU clock/power configuration
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- `overclock`: the _optimized_ card configuration. Includes the clock/voltage/power settings outlined below.
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- `peak`: the same as `overclock`, but with clock gating removed. May help profiling.
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Contrary to the name, the `overclock` profiles can be used to de-tune the card as well.
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## Assumptions / Limitations
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Only tested with `RX6000` series GPUs and the _mainline_ `amdgpu` driver.
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Other permutations may _not_ work properly. Please use at your own risk!
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Multiple GPUs in a single system are not yet managed,
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assumes a single GPU with displays attached.
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## Profiles
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Two _'profiles'_ are in each name:
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- before `amdgpu` is the source profile provided with `tuned`
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- after `amdgpu` tells the GPU clock profile offered, outlined below
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| Output profile | Description |
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|:---|---|
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| `balanced-amdgpu-default` | Includes the (assumed) existing `balanced` tuned profile.<br/><br/>Only adjusts the GPU power limit (typically lower). Clocks/voltage curve remain the default. |
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| `desktop-amdgpu-overclock` | Includes the (assumed) existing `desktop` tuned profile.<br/><br/>Adjusts the GPU power limit, clocks, _and_ the voltage curve. |
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| `desktop-amdgpu-peak` | Includes the (assumed) existing `desktop` tuned profile.<br/><br/>Same as the `overclock` profile, but locks clocks to their highest configured values |
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## Config
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The playbook will render/make effective this config file: `/etc/tuned/amdgpu-profile-vars.conf`
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Here is a preview:
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```ini
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tuned_amdgpu_clock_min=500
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tuned_amdgpu_clock_max=2715
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tuned_amdgpu_memclock_static=1075
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tuned_amdgpu_power_multi_def=0.869969040247678
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tuned_amdgpu_power_multi_oc=1.0
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tuned_amdgpu_mv_offset=+60
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```
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These are the result of [Variables](#Variables) below; changes outside of _Ansible_ are not immediately effective. Switching `tuned` profiles or restarting the service would be required.
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One can use `gamemode` for dynamic switching. Sample `~/.config/gamemode.ini` below:
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```ini
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[custom]
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start=tuned-adm profile latency-performance-amdgpu-overclock
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end=tuned-adm profile latency-performance-amdgpu-default
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```
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See this [Arch Wiki](https://wiki.archlinux.org/title/Gamemode) link for more comprehensive information.
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## Variables
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These are the variables you'll want to change/consider.
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| Variable | Description |
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|------------------------|-------------|
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| `tuned_amdgpu_clock_min` | Mininum **GPU** clock _(in `Mhz`)_ for `overclock` and `peak` profiles |
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| `tuned_amdgpu_clock_max` | Maximum **GPU** clock _(in `MHz`)_ for `overclock` and `peak` profiles |
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| `tuned_amdgpu_mv_offset` | GPU voltage _offset_. Takes `+/-` some integer in _millivolts_ to raise or lower. eg: `-25` for `0.025V` undervolt. |
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| `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 |
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| `tuned_amdgpu_power_multi_oc` | Instance of `tuned_amdgpu_power_multi_def` for `overclock` and `peak` profiles |
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| `tuned_amdgpu_memclock_static` | _Static_ **memory** clock _(in `MHz`)_ for `overclock` and `peak` profiles.<br/><br/>Not the effective data rate _(multiplied by generation)_, but the actual clock. Static assignment avoids potential display flickering. |
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