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updated recommendation for unified memory to reserve 4Gb to the base os.

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Donato Capitella
2025-11-30 12:40:05 +00:00
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README.md
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@@ -338,19 +338,18 @@ This should work on any Strix Halo. For a complete list of available hardware, s
### 6.2 Kernel Parameters (tested on Fedora 42)
Add these these boot parameters to enable unified memory and optimal performance:
Add these boot parameters to enable unified memory while reserving a minimum of 4 GiB for the OS (max 124 GiB for iGPU):
```
amd_iommu=off amdgpu.gttsize=131072 ttm.pages_limit=33554432
amd_iommu=off amdgpu.gttsize=126976 ttm.pages_limit=32505856
```
| Parameter | Purpose |
| --------------------------- | ----------------------------------------------------------------------------------------- |
| `amd_iommu=off` | Disables IOMMU for lower latency |
| `amdgpu.gttsize=131072` | Enables unified GPU/system memory (up to 128 GiB); 131072 MiB ÷ 1024 = 128 GiB |
| `ttm.pages_limit=33554432` | Allows large pinned memory allocations; 33554432 × 4 KiB = 134217728 KiB ÷ 1024² = 128 GiB |
| Parameter | Purpose |
|-----------------------------|--------------------------------------------------------------------------------------------|
| `amd_iommu=off` | Disables IOMMU for lower latency |
| `amdgpu.gttsize=126976` | Caps GPU unified memory to 124 GiB; 126976 MiB ÷ 1024 = 124 GiB |
| `ttm.pages_limit=32505856` | Caps pinned memory to 124 GiB; 32505856 × 4 KiB = 126976 MiB = 124 GiB |
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