light-heart-labs--dreamserver
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2.0 KiB
2.0 KiB
System Tuning for Strix Halo
These files optimize the system for LLM inference on AMD Strix Halo.
Apply all tuning (requires reboot for GRUB/modprobe):
# 1. Kernel boot parameters (GRUB)
# amd_iommu=off gives 2-6% improvement (iommu=pt does NOT give the same benefit)
sudo sed -i 's/GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"/GRUB_CMDLINE_LINUX_DEFAULT="quiet splash amd_iommu=off"/' /etc/default/grub
sudo update-grub
# 2. AMD GPU module options
sudo cp amdgpu.conf /etc/modprobe.d/amdgpu.conf
sudo cp amdgpu_llm_optimized.conf /etc/modprobe.d/amdgpu_llm_optimized.conf
sudo update-initramfs -u
# 3. Memory tuning (applies immediately + persists)
sudo cp 99-ods.conf /etc/sysctl.d/99-ods.conf
sudo sysctl --system
# 4. Enable tuned for CPU governor optimization (5-8% prompt processing improvement)
sudo apt install tuned # or: sudo dnf install tuned
sudo systemctl enable --now tuned
sudo tuned-adm profile accelerator-performance
# 5. Reboot for GRUB + modprobe changes
sudo reboot
What each setting does:
GRUB parameters
amd_iommu=off— disable IOMMU for lower GPU memory access overhead (2-6% improvement)
modprobe (amdgpu.conf)
ppfeaturemask=0xffffffff— enable all power management featuresgpu_recovery=1— enable GPU hang recovery
modprobe (amdgpu_llm_optimized.conf)
gttsize=120000— allocate 120GB as GPU GTT memory (where HIP puts model weights)pages_limit=31457280— max 4KiB pages for GPU memory (120 GB)page_pool_size=15728640— pre-cache ~60GB for GPU usage (reduces allocation latency)
sysctl (99-ods.conf)
vm.swappiness=10— prefer keeping data in RAM (default 60 is too aggressive at swapping)vm.vfs_cache_pressure=50— keep directory/inode caches longer
tuned (accelerator-performance)
- Sets CPU governor to
performance(no power-saving throttling during inference) - Disables CPU idle states for lowest latency
- 5-8% prompt processing improvement measured on Strix Halo