36 lines
5.2 KiB
Markdown
36 lines
5.2 KiB
Markdown
# tuned-amdgpu
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Hacky solution to integrate AMDGPU power control and overclocking in `tuned` with Ansible
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Takes a list of existing `tuned` profiles and creates new ones based on them. These new profiles include AMDGPU power/clock parameters
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An attempt is made to discover the active GPU using the 'connected' state 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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An example of the output/provided profiles follow
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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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## Notable variables
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These are the variables you're likely to want to change. They are defined in [playbook.yml](playbook.yml)
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| Variable | Description | In-playbook |
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|------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| gpu_clock_min | Sets the minimum (dynamic) GPU clock (in `Mhz`) for the non-default `amdgpu` profiles | `700` |
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| 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 |
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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 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 |
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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. | `-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` | <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>|
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| 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%.|
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