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--- notes:kernel_parameters [2023/02/22 15:41] – [Generate] Sean Rhone
+++ notes:kernel_parameters [2024/08/13 18:46] (current) – removed Sean Rhone
@@ Line 1: / Line 1: @@
-====== General ======
-===== Modern Standby =====
-  * https://fwupd.github.io/libfwupdplugin/hsi.html#org.fwupd.hsi.SuspendToIdle
-  sudo grubby --args='mem_sleep_default=s2idle' --update-kernel='ALL'
-  mem_sleep_default=s2idle
-===== IOMMU =====
-  * If IOMMU is disabled in BIOS, this isn't needed
-  * :!: ''iommu=off'' should not be used ([[http://www.xillybus.com/tutorials/iommu-swiotlb-linux|source]])
-  sudo grubby --update-kernel='ALL' --args='iommu=pt'
-  iommu=pt
-===== PCI =====
-  sudo grubby --args='pci=pcie_bus_perf,realloc,pcie_scan_all,big_root_window' --update-kernel='ALL'
-  pci=pcie_bus_perf,realloc,pcie_scan_all,big_root_window
-===== NVMe =====
-  * :!: This may need adjusted for different CPU core counts
-  * :!: Using ''8'' when SMT is disabled with a 2700X does **not** work as-expected ((either don't use this with SMT off, or keep SMT on))
-  * This had no notable benefit in 2022 with a 2700x and SK hynix P31, and was shown in unrelated benchmarks in 2019 to lower performance
-  sudo grubby --args='nvme.poll_queues=16' --update-kernel='ALL'
-  nvme.poll_queues=16
-==== Verify ====
-  dmesg | grep 'nvme'
-  cat '/proc/interrupts'
-===== Custom Resolution =====
-  * For an Acer S271H7 even though it can do 75Hz, this option sets one of the display timings too-high and 75Hz can't be reduced-blanked here; 74Hz is close enough
-  * This is necessary for Wayland, but also carries over to Xorg
-  * :!: Refresh rate mismatch between Moonlight clients and Gamestream hosts computers introduces stuttering
-  sudo grubby --args='video=HDMI-A-1:1920x1080@74' --update-kernel='ALL'
-  video=HDMI-A-1:1920x1080@74
-====== AMD ======
-==== Memory Encryption ====
-  * https://fwupd.github.io/libfwupdplugin/hsi.html#org.fwupd.hsi.EncryptedRam
-  * :!: Requires CPU SVM to be enabled in BIOS ((AMDGPU will likely panic on-boot if ''mem_encrypt'' is enabled without SVM))
-  * Disable TSME in BIOS if using this
-  sudo grubby --args='mem_encrypt=on' --update-kernel='ALL'
-  mem_encrypt=on
-====== AMDGPU ======
-===== Overclocking =====
-  * Allows use of Overdrive options for overclocking and increasing the Power Limit
-==== Generate ====
-  * https://wiki.archlinux.org/title/AMDGPU#Boot_parameter
-  * :!: This requires ''amdgpu.ppfeaturemask'' to not already be set
-  printf 'amdgpu.ppfeaturemask=0x%x\n' "$(($(cat /sys/module/amdgpu/parameters/ppfeaturemask) | 0x4000))"
-==== Kernel Option ====
-  * See [[https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/amd/include/amd_shared.h#L203|amd_shared.h]] for more ''PP_FEATURE_MASK'' values
-  * :!: ''0xffffffff'' can be used to enable everything, but may cause issues with unstable features
-  sudo grubby --args='amdgpu.ppfeaturemask=0xffffffff' --update-kernel='ALL'
-  amdgpu.ppfeaturemask=0xffffffff
-==== Verify ====
-****
-  cat '/sys/module/amdgpu/parameters/ppfeaturemask'
-====== Intel ======
-===== IOMMU =====
-  * TODO: HSI?
-  sudo grubby --update-kernel='ALL' --args='intel_iommu=on'
-  intel_iommu=on
-===== Optimizations =====
-  * This enables Framebuffer compression, Panel self-refresh, and i915 Fastboot
-  sudo grubby --update-kernel='ALL' --args='i915.enable_fbc=1 i915.enable_psr=1 i915.fastboot=1'
-  i915.enable_fbc=1 i915.enable_psr=1 i915.fastboot=1
-===== Firmware =====
-  * This enables GuC and HuC firmware loading if supported by the hardware
-  sudo grubby --update-kernel='ALL' --args='i915.enable_guc=3'
-  i915.enable_guc=3
-====== NVIDIA ======
-===== Open Module =====
-==== Blacklist nouveau ====
-  sudo grubby --update-kernel='ALL' --args='modprobe.blacklist=nouveau'
-  modprobe.blacklist=nouveau
-==== Allow Unsupported GPUs ====
-  * https://github.com/NVIDIA/open-gpu-kernel-modules#compatible-gpus
-  sudo grubby --update-kernel='ALL' --args='nvidia.NVreg_OpenRmEnableUnsupportedGpus=1'
-  nvidia.NVreg_OpenRmEnableUnsupportedGpus=1
-==== Enable nvidia-modeset ====
-  sudo grubby --update-kernel='ALL' --args='nvidia-drm.modeset=1'
-  nvidia-drm.modeset=1
-===== PAT =====
-  * TODO: Find information about this
-  sudo grubby --update-kernel='ALL' --args='nvidia.NVreg_UsePageAttributeTable=1'
-  nvidia.NVreg_UsePageAttributeTable=1
-===== GSP =====
-  * https://us.download.nvidia.com/XFree86/Linux-x86_64/515.65.01/README/gsp.html
-  * Allows loading of GSP firmware
-  * This doesn't appear necessary for the open kernel module
-  * :!: 2022/07/20 515.57: this causes AoE2:DE to crash GNOME on-startup
-  sudo grubby --update-kernel='ALL' --args='nvidia.NVreg_EnableGpuFirmware=1'
-  nvidia.NVreg_EnableGpuFirmware=1'
-==== Verify ====
-****
-  nvidia-smi -q | grep 'GSP'
-====== Coreboot ======
-===== Flashing =====
-  * This is needed to relax permissions for Coreboot firmware to be flashed internally
-  * :!: This should be removed after flashing
-  sudo grubby --update-kernel='ALL' --args='iomem=relaxed'
-  iomem=relaxed