Linux Kernel with several sccheduler and other improvements

General Informations

The CachyOS are improved kernels which improve the performance and other improvements. Following Scheduler are supported:

Standard Kernel Completely Fair Scheduler (CFS) - linux-cachyos
CacULE and CacULE-RDB created from Hamad Marri, maintained by CachyOS - linux-cachyos-cacule
BitMap Queue (BMQ) Alfred Chen Scheduler - linux-cachyos-bmq
Priority and Deadline based Skiplist multiple queue scheduler (PDS) - Alfred Chen Scheduler » linux-cachyos-pds
Task Type Scheduler by Hamad Marri (TT) - linux-cachyos-tt
BORE (Burst-Oriented Response Enhancer) CPU Scheduler by firelzrd (BORE) - linux-cachyos-bore

All kernels are prebuilt in two different march versions (x86_64 and x86_64_v3) and also with the lto enabled kernels in the cachyos repo.

Features

Very customizable PKGBUILD with many features and improvements
5 Different scheduler are supported, CacULE-,CFS-,tt-,bmq-,bore-, and pds scheduler
GCC/CLANG Optimization with automatically found cpu arch or also selectable cpu arch
Choose between LLVM/LTO or GCC
Choose between 500Hz, , 600 Hz ,750Hz, 1000Hz
Improved BFQ Scheduler
Generell improved ssctl settings and upstream scheduler fixes
Latest LRU Patch-set
BBRv2 tcp_congestion_control
LLVM ThinLTO provided with *-lto Kernel (in the cachyos-repo)
LRNG Framework (default enabled)
WINEFSYNC and the new futex wait v implementation (futex2) which will be upstream in 5.17
Android ANBOX patch-set
Latest Paragon NTFS3 driver support and fixes
Latest & improved ZSTD patch-set
Some Security related patches. More here: Fork-Brute spectre
Latest BTRFS improvements & fixes
KSMBD Module for Samba3 Server
Using the lates MG-LRU v5 patch paired with and the new implemented damon. The damon replaces the le9, but the le9 can be still enabled
AMD PSTATEv4 Driver
Clearlinux Patchset
Control Flow Integrity (CFI) slectable when using LLVM
experimental PGO building selectable (at the moment not working)

Some Tips & Tricks

You can tune the scheduler by setting these sysctl values

net.core.netdev_max_backlog = 16384
net.core.somaxconn = 8192
net.core.rmem_default = 1048576
net.core.rmem_max = 16777216
net.core.wmem_default = 1048576
net.core.wmem_max = 16777216
net.core.optmem_max = 65536
net.ipv4.tcp_rmem = 4096 1048576 2097152
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.udp_rmem_min = 8192
net.ipv4.udp_wmem_min = 8192
net.ipv4.tcp_fastopen = 3
net.ipv4.tcp_keepalive_time = 60
net.ipv4.tcp_keepalive_intvl = 10
net.ipv4.tcp_keepalive_probes = 6
net.ipv4.conf.default.log_martians = 1
net.ipv4.conf.all.log_martians = 1
net.ipv4.tcp_mtu_probing = 1
net.ipv4.tcp_syncookies = 1
net.core.default_qdisc = cake
net.ipv4.tcp_congestion_control = bbr2

We are providing a repo which includes all kernels in generic-v3 and generic and more optimized packages

How to add our Repo automatically with CPU detection (if x86-64-v3 is supported)

Just run following command:

automatic march detection and changing the pacman.conf:

wget https://mirror.cachyos.org/cachyos-repo.tar.xz
tar xvf cachyos-repo.tar.xz
cd repo
sudo ./cachyos-repo.sh

manually:

sudo pacman-key --recv-keys F3B607488DB35A47 --keyserver keyserver.ubuntu.com

sudo pacman-key --lsign-key F3B607488DB35A47

sudo pacman -U 'https://mirror.cachyos.org/repo/x86_64/cachyos/cachyos-keyring-2-1-any.pkg.tar.zst' 'https://mirror.cachyos.org/repo/x86_64/cachyos/cachyos-mirrorlist-6-1-any.pkg.tar.zst' 'https://mirror.cachyos.org/repo/x86_64/cachyos/cachyos-v3-mirrorlist-6-1-any.pkg.tar.zst'

  **Checking x86_64_v3 cpu support:**

  /lib/ld-linux-x86-64.so.2 --help | grep "x86-64-v3 (supported, searched)"

  if you get an output change at the /etc/pacman.conf following:
  ```
  #Architecture = auto
  Architecture = x86_64 x86_64_v3
  ```
  add following under the arch repos the "-v3" repos only if they are supported:
  ```
  # cachyos repos
  [cachyos-desktop-v3]
  Include = /etc/pacman.d/cachyos-v3-mirrorlist
  [cachyos-v3]
  Include = /etc/pacman.d/cachyos-v3-mirrorlist
  [cachyos-desktop]
  Include = /etc/pacman.d/cachyos-mirrorlist
  [cachyos]
  Include = /etc/pacman.d/cachyos-mirrorlist
  ``\`

This script will also backup your old pacman.conf.

This script will auto-detect you architecture, if your CPU have x86-64-v3 support, it will automatically use the repos which are optimized with this flag and some other flags.

Also all provided Kernels, Browsers, ... are optimized and compiled.

## How to Backup the config and use the native Arch Packages

- Remove or Backup the config located at /etc/pacman.conf
- then run `sudo mv /etc/pacman.conf.bak /etc/pacman.conf`
- Then run following command to switch the packages to the default arch packages `sudo pacman -Suuy`


More information's you will find here [CachyOS](https://github.com/cachyos) or [Discord](https://discord.gg/k39qfrxPNa)

How to use CLANG/LLVM/LTO compiled Kernels on Nvidia driver with DKMS:

Not needed anymore, just install the latest dkms version (3.0.2).

Donations are welcome for the compile server for the repo or a cup of coffee for maintain this repo

https://paypal.me/pttrr

Valueable Contributors

Hamad Marri for the CacULE Scheduler

BL4CKH47H4CK3R for Optimization, Bug Hunting & Support

SirLucjan (Piotr Gorski) for many cool patches

Archlinux for the great linux operating system

And all other Kernel Developers and Supporters

Neucher/linux-cachyos