CachyOS

CachyOS ships improved kernels that improve performance and other aspects.

• General Information about kernels
  • linux-cachyos
  • Features
• CachyOS repositories
  • How to add CachyOS repositories
  • Check CPU compatibility
• Other GNU/Linux distributions
  • Gentoo
  • Fedora
• Revert changes
• Support

The Schedulers listed below are supported

We provided all of these CPU schedulers because each scheduler performs differently and depends on usage. Please test it and choose what suits your requirements.

• (BORE) - Burst-Oriented Response Enhancer Scheduler by firelzrd (BORE) linux-bore / linux-cachyos-bore
• (EEVDF) - Earliest Eligiable Virtual Deadline First EEVDF is a replacement for the CFS Scheduler from Peter Zijlstra linux-cachyos
• (TT) - Task Type Scheduler by Hamad Marri - linux-cachyos-tt / linux-tt
• (BMQ) - BitMap Queue by Alfred Chen - linux-cachyos-bmq
• (PDS) - Priority and Deadline based Skiplist multiple queue by Alfred Chen - linux-cachyos-pds
• (CFS) - Standard Scheduler Completely Fair Scheduler - linux-cachyos-cfs

• CacULE and CacULE-RDB by Hamad Marri, supported by CachyOS in the past as - linux-cachyos-cacule
  ATTENTION: Not supported after version 6.1. If you still want to use it, you can get it from the archive repository - linux-cacule

All kernels are prebuilt in two different march versions (x86-64, x86-64-v3 and x86-64-v4) and also with the LTO-enabled kernels in the cachyos repositories.

Here is a list of features of linux kernels prebuilt in x86-64-v4, x86-64-v3 and x86-64 in the CachyOS repositories.

• Very customizable PKGBUILD with many features and improvements.
• GCC/CLANG Optimization with automatically found CPU architecture or also selectable CPU architecture.
• Choose between LLVM/LTO & Thin-LTO or GCC - experimental GCC LTO support is available.
• Choose between 300Hz, 500Hz, 600 Hz ,750Hz and 1000Hz. Defaults to 500Hz for BORE/CFS and 1000Hz for other schedulers.
• Kernel Control Flow Integrity (kCFI) selectable when using LLVM - patched llvm can be found in the cachyos-repositories.

• 5 Different scheduler are supported,CFS,tt,bmq,bore, and pds scheduler.
• AMD PSTATE EPP and AMD PSTATE Guided Driver enabled by default and with enhancements patches/fixes.
• Latency Nice Patchset included usuage with ananicy-cpp feature branch.
• RCU fixes and improvements.
• EEVDF Scheduler used in linux-cachyos # https://lwn.net/Articles/927530/

• Latest BTRFS/XFS/EXT4 improvements & fixes.
• ZFS Filesystem Support and prebuilt in the repository.
• Latest & improved ZSTD 1.5.4 patch-set.
• UserKSM daemon from pf.
• Improved BFQ Scheduler.
• support for bcachefs.
• per VMA lock - default disabled
• zram patches from upstream

• BBRv2 tcp_congestion_control.
• KSMBD Module for Samba3 Server.

• Clearlinux Patchset.
• Back-ported patches from linux-next.
• Scheduler patches from linux-next/tip.
• General improved sysctl settings and upstream scheduler fixes.
• LRNG Framework - default disabled
• OpenRGB and ACS Override support.
• HDR Patches for AMD GPU's and gamescope
• KVM Performance Improvement from Yu Zhao
• Objtool Patches to reduce the memory usage
• maple-tree and MG-LRU fixes from upstream

Repositories contain Arch Linux and CachyOS unique packages, but re-build with flags focused on performance, stability and security.

• x86-64-v4 - currently only kernel packages + LTO.
• x86-64-v3 - all Arch Linux packages + LTO.
• x86-64 - all Arch Linux packages + LTO.

Run following commands:

1. Get archive with script

wget https://mirror.cachyos.org/cachyos-repo.tar.xz

If don't have wget, install them by sudo pacman -S wget

2. Extract and enter into the archive

tar xvf cachyos-repo.tar.xz && cd cachyos-repo

3. Run script with sudo

sudo ./cachyos-repo.sh

1. Script will auto-detect CPU architecture, if CPU have x86-64-v4 or x86-64-v3 support, script will automatically use the repositories which are optimized with this flag > and some other flags.
2. Script will backup your old pacman.conf.

1. Add both keys

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

sudo pacman-key --lsign-key F3B607488DB35A47

2. You can download first initial packages

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-17-1-any.pkg.tar.zst' 'https://mirror.cachyos.org/repo/x86_64/cachyos/cachyos-v3-mirrorlist-17-1-any.pkg.tar.zst' 'https://mirror.cachyos.org/repo/x86_64/cachyos/cachyos-v4-mirrorlist-5-1-any.pkg.tar.zst' 'https://mirror.cachyos.org/repo/x86_64/cachyos/pacman-6.0.2-10-x86_64.pkg.tar.zst'

If you want to add our repositories manually, you must check the compatibility of the CPU with cachyos repositories.

If you use script above for adding cachyos repositories, you can skip checking.

/lib/ld-linux-x86-64.so.2 --help | grep supported

Pay attention to the following text with brackets. (supported, searched)

• If you see x86-64-v4 (supported, searched), that means the CPU is compatible and can use x86-64-v4 instruction set.
• If you see x86-64-v4, that means the CPU is incompatible and can't use x86-64-v4 instruction set.

> /lib/ld-linux-x86-64.so.2 --help | grep supported
  x86-64-v4 (supported, searched)
  x86-64-v3 (supported, searched)
  x86-64-v2 (supported, searched)
  haswell (AT_PLATFORM; supported, searched)
  tls (supported, searched)
  avx512_1 (supported, searched)
  x86_64 (supported, searched)

  > /lib/ld-linux-x86-64.so.2 --help | grep supported
     STDIN
  40 Subdirectories of glibc-hwcaps directories, in priority order:
  41   x86-64-v4
  42   x86-64-v3 (supported, searched)                                          
  43   x86-64-v2 (supported, searched)       

You need edit pacman.conf and add repositories.

sudo nano /etc/pacman.conf

# cachyos repos
## Only add if your CPU does v3 architecture
[cachyos]
Include = /etc/pacman.d/cachyos-mirrorlist

# cachyos repos
## Only add if your CPU does v3 architecture
[cachyos-v3]
Include = /etc/pacman.d/cachyos-v3-mirrorlist
[cachyos-community-v3]
Include = /etc/pacman.d/cachyos-v3-mirrorlist
[cachyos]
Include = /etc/pacman.d/cachyos-mirrorlist

# cachyos repos
## Only add if your CPU does support x86-64-v4 architecture
[cachyos-v4]
Include = /etc/pacman.d/cachyos-v4-mirrorlist
[cachyos-v3]
Include = /etc/pacman.d/cachyos-v3-mirrorlist
[cachyos-community-v3]
Include = /etc/pacman.d/cachyos-v3-mirrorlist
[cachyos]
Include = /etc/pacman.d/cachyos-mirrorlist

• Complete patch for simple patching on the kernel
• It is planned to implement into our kernel builder from cachyos buildsystem, which works also on other distributions.

Its a community maintained ebuild from a user, which can be used for a dynamic building right here

Or simply run:

eselect repository enable ROKO__
emaint sync -r ROKO__

Port of kernel linux-cachyos-bore and linux-cachyos-bore-lto by bieszczaders

Only x86_64_v3 versions are available. Check support by the following the command

/lib64/ld-linux-x86-64.so.2 --help | grep "(supported, searched)"

If it does not detect x86_64_v3 support do not install the kernel. Otherwise you will end up with a non-functioning operating system!

sudo dnf copr enable bieszczaders/kernel-cachyos

and next

sudo dnf install kernel-cachyos-bore

OR

sudo dnf install kernel-cachyos-bore-lto

If you build external modules (e.g. for Nvidia graphics card drivers) and use the -lto kernel, you need to install the following dependencies:

sudo dnf install clang clang-devel llvm lld

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

Not needed anymore, just install the latest dkms version from our repo.

Discord: https://discord.gg/qJqj94uFwE
Telegram: https://t.me/+zCzPX4cAFjk1MTYy
Matrix: https://matrix.cachyos.org

PayPal: https://paypal.me/pttrr
Patreon: https://www.patreon.com/CachyOS
BTC: bc1qmwglfchlc335du6pcu6w64cexu7cck0mzhyw42
ETH: 0xc2dc77327F78A7B85Db3941Eb49e74F41E961649

Hamad Marri for the TT Scheduler
Archlinux for the great linux operating system
And all other Kernel Developers and Supporters