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README: add new voltage var and profile breakdown

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# tuned-amdgpu
hacky solution to integrate AMDGPU power profile control in `tuned` with Ansible
Hacky solution to integrate AMDGPU power profile control 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
## Profiles
An example of the output/provided profiles follow
| Output profile | Description |
|---|---|
| `balanced-amdgpu-default` | Includes the existing `balanced` tuned profile. Only adjusts the GPU power limit (typically lower), clocks/voltage curve remain the default. |
| `desktop-amdgpu-VR` | Includes the existing `desktop` tuned profile. Adjusts the GPU power limit, clocks, and the voltage curve -- using the predefined `VR` profile in the driver |
| `latency-performance-amdgpu-custom` | Includes the existing `latency-performance` tuned profile. Adjusts the GPU power limit, clocks, and the voltage curve -- using the `custom` profile in the driver. This opens up further tweaking through the driver (currently manual). see: [pp-dpm](https://docs.kernel.org/gpu/amdgpu/thermal.html#pp-dpm) |
## Notable variables
- Power control: (float) multipliers to determine power _limits_ from board power _capability_
- `power_max_default_multi`: Controls power for the generated `default` GPU profile. Provided: `0.75` for 75% board power capability.
- `power_max_custom_multi`: Controls power for the generated `custom` GPU profile. Provided: `1.0` for 100% board power capability.
- `card`: Sets the `card#` to use in the qualified `sysfs` path `/sys/class/drm/{{ card }}/device/pp_power_profile_mode`. Default: `card0`
- `gpu_mv_offset`: optional, applies offset to GPU voltage, eg: `+100` = to boost GPU core voltage `100mV` or `0.1V`. Can undervolt.
- `base_profiles`: List of base tuned profiles to clone in the new AMDGPU profiles. Defaults (based on `Fedora`):
- `balanced`
- `desktop`
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- `network-throughput`
- `powersave`
- `virtual-host`
- `amdgpu_profiles`: Mapping of AMDGPU power profiles (`name`/`value`) defined in the `sysfs` path above. Varies, sample is with a 6900XT. Defaults:
- `{ name: 'default', value: 0 }`
- `{ name: 'custom', value: 6 }`
## Example profiles/output
`amdgpu_profiles`: Mapping of AMDGPU power profiles (`name`/`value`) defined in the `sysfs` path above. Varies, sample is with a 6900XT. Defaults below
```
$ tuned-adm profile
Available profiles:
- accelerator-performance - Throughput performance based tuning with disabled higher latency STOP states
- balanced - General non-specialized tuned profile
- balanced-amdgpu-custom - balanced + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = 6 (custom)
- balanced-amdgpu-default - balanced + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = 0 (default)
- desktop - Optimize for the desktop use-case
- desktop-amdgpu-custom - desktop + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = 6 (custom)
- desktop-amdgpu-default - desktop + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = 0 (default)
- hpc-compute - Optimize for HPC compute workloads
- intel-sst - Configure for Intel Speed Select Base Frequency
- latency-performance - Optimize for deterministic performance at the cost of increased power consumption
- latency-performance-amdgpu-custom- latency-performance + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = 6 (custom)
- latency-performance-amdgpu-default- latency-performance + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = 0 (default)
- network-latency - Optimize for deterministic performance at the cost of increased power consumption, focused on low latency network performance
- network-latency-amdgpu-custom- network-latency + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = 6 (custom)
- network-latency-amdgpu-default- network-latency + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = 0 (default)
- network-throughput - Optimize for streaming network throughput, generally only necessary on older CPUs or 40G+ networks
- network-throughput-amdgpu-custom- network-throughput + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = 6 (custom)
- network-throughput-amdgpu-default- network-throughput + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = 0 (default)
- optimize-serial-console - Optimize for serial console use.
- powersave - Optimize for low power consumption
- powersave-amdgpu-custom - powersave + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = 6 (custom)
- powersave-amdgpu-default - powersave + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = 0 (default)
- throughput-performance - Broadly applicable tuning that provides excellent performance across a variety of common server workloads
- virtual-guest - Optimize for running inside a virtual guest
- virtual-host - Optimize for running KVM guests
- virtual-host-amdgpu-custom - virtual-host + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = 6 (custom)
- virtual-host-amdgpu-default - virtual-host + TCP/RAID tweaks + AMDGPU pp_power_profile_mode = 0 (default)
Current active profile: network-latency-amdgpu-default
amdgpu_profiles: # statically defined mapping of the contents in /sys/class/drm/card*/device/pp_power_profile_mode
default: # more may be added, but do not remove default/custom. new profiles require a script template, see 'templates'
pwrmode: 0
VR:
pwrmode: 4
custom:
pwrmode: 6
```