✏️ Starting notes on gentoo
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gentoo/kernel_compilation_defaults.md
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gentoo/kernel_compilation_defaults.md
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# Kernel Compilation Defaults
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This document contains some basic notes of which Kernel Customization Flags
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Mental Outlaw recommends in his
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[video](https://www.youtube.com/watch?v=NVWVHiLx1sU) on the topic. Keep in mind
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that his video was done for a kernel 5 years ago at the time of this writing,
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and so it is likely we'll have to adjust. This document is just to give us, a
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potential new gentoo user, a baseline of what to focus on.
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Firstly, however, let's talk about what we'll need to do prior to following his
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guide. The
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[Gentoo AMD64 Handbook Page on Kernel Configuration](https://wiki.gentoo.org/wiki/Handbook:AMD64/Installation/Kernel)
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had extensive documentation and different methods for installing the Linux
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Kernel. Prior to starting, it is probably a good idea to install the firmware:
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```sh
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emerge --ask sys-kernel/linux-firmware && \
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emerge --ask sys-firmware/sof-firmware
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```
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Afterwards which there are methods using **installkernel** and **dracut** that
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we followed first and we've documented elsewhere. This is to get the
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distribution kernel installed, which we still recommend as a default method so
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that you have a working kernel should you make a mistake in compiling your own.
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Look at the link above or consult our other documentation on the subject should
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you need to follow those instructions first.
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## Installing Kernel Sources
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```sh
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emerge --ask sys-kernel/gentoo-sources
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```
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This installs kernel sources in `/usr/src/` using the specific kernel path. It
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will not create a symbolic link by itself without the symlink USE flag being
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enabled on the chosen kernel sources package.
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It is conventional for a `/usr/src/linux` symlink to be maintained, such that it
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refers to whichever sources correspond with the currently running kernel.
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However, this symbolic link will not be created by default. An easy way to
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create the symbolic link is to utilize eselect's kernel module.
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For further information regarding the purpose of the symlink, and how to manage
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it, please refer to
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[Kernel/Upgrade](https://wiki.gentoo.org/wiki/Kernel/Upgrade).
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First, list all installed kernels:
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```sh
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eselect kernel list
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```
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And in order to create a symbolic link called linux, use:
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```sh
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eselect kernel set 1
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```
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Where 1 is the number on the list of the kernel you just built.
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## Mental Outlaw's Config:
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This is my interprestation of Mental Outlaw's Config, keep in mind I have
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omitted or edited some things he mentions in the video as they do not pertain to
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my particular use case.
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Within the makemenuconfig:
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General Setup >
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> Kernel Compression Mode
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> LZ4
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> POSIX Message Queues > disabled
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> Disable process_vm_readv/writev syscalls
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> Disable uselib syscalls (old C libs)
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> Auditing support (required by SELinux)
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> Timer subsystem > Periodic timer ticks (better performance, no sleep mode)
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> Disable Old Idle dynticks config
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> Disable High Resolution Timer Support
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> CPU/Task time and stats accounting
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> Disable BSD Process Counting
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> Disable Export task/process statistics through netlink
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> Kernel log buffer size (how much space you want to use for kernel log)
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> set to 15
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> CPU kernel log buffer size contribution
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> set to 15
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> Temporary per-CPU printk log buffer size
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> set to 12
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> Disable Initial RAM filiesystem and RAM disk support (consider keeping this one)
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> Compiler optimization level
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> Select Optimize for performance
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> Choose SLAB allocator
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> choose SLUB (Unqueued Allocator)
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Processor type and features >
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> Disable MPS table
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> Disable Support for extended (non-PC) x86 platforms
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> Processor family >
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> Change from Generic x86/64 to Core 2/newer Xeon (intel specific, don't change)
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> Maximum number of CPUs
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> Change to threads count on your current CPU (desktop 24)
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> Multi-core scheduler support
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> Disable if CPU thread count is low
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> Disable Reroute for broken boot IRQs
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> Disable Intel MCE features (opposite Mental Outlaw, since you're on AMD)
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> Performance monitoring
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> Uncheck all Intel options, and check all AMD options
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> Disable IOPERM and IOPL Emulation
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> Disable Intel microcode loading support
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> Disable 5-level page tables support
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> Disable NUMA Memory Allocation and Scheduler Support
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> Disable Check for low memory corruption
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> Enable MTRR cleanup support
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> setup both values to 1
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> Disable Intel Memory Protection Keys
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> Power Management and ACPI options
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> Disable Suspend to RAM and standby (no sleep mode, keep enabled for laptops)
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> Disable Power Management Debug Support (same reason above)
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> If on Intel, enable Cpuidle Driver for Intel Processors
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> Virtualization
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> Enable Host kernel accelerator for virtio net (not M, * it)
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> Enable loadable module support
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> Disable Forced module unloading
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> Enable the block layer
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> Disable Block layer debugging information in debugfs
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> Networking support
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> Disable Amateur Radio support
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> Enable Bluetooth subsystem support
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> Enable Wireless
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> Enable Netlink interface for ethtool
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> Device Drivers
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> Disable PCCard support
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> Block devices
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> Number of loop deviceds to pre-create at init time to 0
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> NVME Support make sure to build support into it for kernel
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> SCSI device support
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> Enable Asynchronous SCSI scanning
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> Disable Multiple devices driver support (RAID and LVM)
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> Disable Macintosh device drivers
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> Input device support
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> Mice >
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> Disable PS/2 mouse
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> Joysticks/Gamepads >
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> Disable whatever you won't be using
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> Disable Tablets
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> Disable Touchscreens
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> Graphics support
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> Maximum number of GPUs to 2
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> Enable Nouveau
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> Enable Virtual Box Graphics Card
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> File systems
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> Ensure ext4 is all enabled
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> Disable Miscellaneous filesystems
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> Disable Network File Systems (unless on NAS drive)
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> Kernel hacking
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> RCU Debugging
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> RCU CPU stall timeout in seconds to 3
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> Gentoo Linux
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> Support for init systems, system and service managers
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> OpenRC, runit and other script based systems and managers
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Then just save it, it will save it to .config. Then:
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```sh
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make -j $(nproc) && make modules install && make install
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```
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