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--- notes:kernel_parameters [2021/06/18 02:36] – removed Sean Rhone
+++ notes:kernel_parameters [2022/09/02 09:41] – created Sean Rhone
@@ Line 1: / Line 1: @@
+====== General ======
+===== 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
+===== 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))
+  sudo grubby --args='nvme.poll_queues=16' --update-kernel='ALL'
+  nvme.poll_queues=16
+==== Verify ====
+  dmesg | grep 'nvme'
+  cat '/proc/interrupts'
+====== NVIDIA ======
+===== 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
+  * :!: 2022/07/20 515.57: This doesn't appear beneficial
+  sudo grubby --update-kernel='ALL' --args='nvidia.NVreg_EnableGpuFirmware=1'
+  nvidia.NVreg_EnableGpuFirmware=1'
+==== Verify ====
+****
+  nvidia-smi -q | grep 'GSP'
+====== AMDGPU ======
+===== Overclocking =====
+  * Allows use of Overdrive options for overclocking and increasing the Power Limit
+  sudo grubby --args='amdgpu.ppfeaturemask=0xffffffff' --update-kernel='ALL'
+  amdgpu.ppfeaturemask=0xffffffff
+==== Verify ====
+****
+  cat '/sys/module/amdgpu/parameters/ppfeaturemask' | grep '0xffffffff'
+====== 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