76 lines
3.5 KiB
Markdown
76 lines
3.5 KiB
Markdown
# tuned-amdgpu
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Hacky solution to integrate AMDGPU power control and overclocking in
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`tuned` with Ansible.
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_TLDR:_ See [my host_vars](./host_vars/localhost.yml) for an overview.
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A host will have a collection of `tuned` profiles.
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For example: `desktop`, `balanced`, `virt-host`
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*This* role extends *those* with AMD GPU power/clock/voltage control.
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Each gets `default`, `overclock`, and `peak` variations.
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An attempt is made to discover the active GPU using the 'connected' state
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in the `DRM` subsystem, example:
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```bash
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~ $ grep -ls ^connected /sys/class/drm/*/status | grep -o card[0-9] | sort | uniq | sort -h | tail -1
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card1
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```
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_Warning_: This is only tested with `RX6000` series GPUs, it is probable that other generations will *not* work properly. Use at your own risk!
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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 this config file: `/etc/tuned/amdgpu-profile-vars.conf`
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Here is a preview:
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```shell
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gpu_clock_min=500
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gpu_clock_max=2715
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gpumem_clock_static=1075
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gpu_power_multi_def=0.869969040247678
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gpu_power_multi_oc=1.0
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gpu_mv_offset=+60
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```
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Changes will require switching `tuned` profiles to re-read/apply the config.
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One can use [gamemode](https://wiki.archlinux.org/title/Gamemode) to do this automatically on start/stop.
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Sample `~/.config/gamemode.ini`:
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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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## 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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| gpu_clock_min | Sets the min (dynamic) GPU clock (in `Mhz`) for the non-default `amdgpu` profiles |
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| gpu_clock_max | Sets the max (dynamic) GPU clock (in `MHz`) for the non-default `amdgpu` profiles |
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| gpumem_clock_static | Sets the _static_ memory clock for the GPU (in `MHz`). This is *not* the _effective_ data rate. _That_ would be a multiple of _this_ depending on the type of VRAM.<br/><br/>To avoid flickering this is *not* allowed to change with load, only between `default` and `overclock`/`peak` profiles. |
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| gpu_mv_offset | GPU core voltage offset. Takes +/- some integer in millivolts. Can be used to both over _and_ under volt. eg: `-50` _(undervolt `50mV` or `0.05V`)_ |
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| base_profiles | List of base tuned profiles to clone in the new AMDGPU profiles. Defaults based on `Fedora` |
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| gpu_power_multi_def | Float between `0.0` and `1.0`; controls power limit relative to the board _capability_. For _'default'_-named power profiles. |
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| gpu_power_multi_oc | Similar to `gpu_power_multi_def`, for _'overclock'_-named power profiles. |
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