tuned-amdgpu/README.md

# tuned-amdgpu

Hacky solution to integrate AMDGPU power control and overclocking in `tuned` with Ansible

Takes a list of existing `tuned` profiles and creates new ones based on them.  These new profiles include AMDGPU power/clock parameters

An attempt is made to discover the active GPU using the 'connected' state in the `DRM` subsystem, example:
```
$ grep -ls ^connected /sys/class/drm/*/status | grep -o card[0-9] | sort | uniq | sort -h | tail -1
card1
```

_Warning_: This is only tested with `RX6000` series GPUs, it is probable that other generations will *not* work properly.  Use at your own risk!

## Profiles

An example of the output/provided profiles follow

| Output profile | Description |
|:---|---|
| `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. |
| `desktop-amdgpu-overclock` | Includes the (assumed) existing `desktop` tuned profile.<br/><br/>Adjusts the GPU power limit, clocks, _and_ the voltage curve. |

## Notable variables

These are the variables you're likely to want to change.  They are defined in [playbook.yml](playbook.yml)

| Variable               | Description                                                                                                                                                                                                                                                                                                                                | In-playbook                                                                                                                                                                  |
|------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| gpu_clock_min          | Sets the minimum (dynamic) GPU clock (in `Mhz`) for the non-default `amdgpu` profiles                                                                                                                                                                                                                                                                 | `700`                                                                                                                                                    |
| gpu_clock_max          | Sets the maximum (dynamic) GPU clock (in `MHz`) for the non-default `amdgpu` profiles                                                                                                                                                                                                                                                                 | `2600`, results in `2.6GHz` (rounded); mild overclock                                                                                                                     |
| gpumem_clock_static       | Sets the _static_ memory clock for the GPU (in `MHz`).  This is *not* the _effective_ data rate.  That is a multiple of this depending on the type of VRAM.<br/><br/>To avoid flickering this does *not* change dynamically with load.                                                                                                                | `1050`, results in just over `1GHz`; mild overclock<br/><br/>Actual effective clock depends on this being multiplied against the data/pump rate of the `GDDR?` GPU memory                                                                                                                                  |
| gpu_mv_offset          | GPU core voltage offset.  Takes +/- some integer in millivolts.  Can be used to both over _and_ under volt.                                                                                                                                                                                                                                | `-50` (undervolt `50mV` or `0.05V`)                                                                                                                                     |
| base_profiles          | List of base tuned profiles to clone in the new AMDGPU profiles.  Defaults based on `Fedora`                                                                                                                                                                                                                                               | <ul><li>`balanced`</li><li>`desktop`</li><li>`latency-performance`</li><li>`network-latency`</li><li>`network-throughput`</li><li>`powersave`</li><li>`virtual-host`</li>|
| gpu_power_multi        | Dictionary with two keys, `default` and `overclock`. Expects two floats to set a power limit relative to the board _capability_. Example: `1.0` is full board capability, `0.5` is 50%.|