77 lines
3.5 KiB
Markdown
77 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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with [AMDGPU hwmon interfaces](https://docs.kernel.org/gpu/amdgpu/thermal.html) in three variations:
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- `default`: the out-of-the-box GPU clock/power configuration
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- `overclock`: the _optimized_ card configuration. Includes [profile variables](#variables) with clock/voltage/power.
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- `peak`: the same as `overclock` with gating removed. Intended for profiling.
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Contrary to the name, the `overclock` profile may also be used to _under-{volt,clock}_.
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## Assumptions / Limitations
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Only tested with `RX6000` series GPUs and the _mainline_ `amdgpu` driver. Other permutations
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_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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Please report any issues or PRs, all will be considered.
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## Config
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```ini
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; file: /etc/tuned/amdgpu-profile-vars.conf
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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 represent the [Variables below](#variables); changes outside of _Ansible_
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are not immediately effective, requiring switching profiles or restarting the service.
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The `gamemode` service offers dynamic switching. Please see this [Arch Wiki](https://wiki.archlinux.org/title/Gamemode) document
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for more information. Example:
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```ini
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; ~/.config/gamemode.ini snippet
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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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## 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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## 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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