Linux Kernel with several scheduler 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
- Back-ported patches from linux-next
- General improved sysctl 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
- page-table-patch included
- 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 latest MG-LRU v5 patch paired with and the new implemented damon.
- AMD PSTATEv7 Driver
- Clearlinux Patchset
- Control Flow Integrity (CFI) slectable when using LLVM
- experimental PGO building selectable (at the moment not working)
Other distros
- First I will release every kernel update with a complete patch for every scheduler and their config.
- Next I will implement a building system so it is possible to build the kernel for several distros.
- Maybe I will provide some releases for debian based distros.
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-8-1-any.pkg.tar.zst' 'https://mirror.cachyos.org/repo/x86_64/cachyos/cachyos-v3-mirrorlist-8-1-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-v3]
Include = /etc/pacman.d/cachyos-v3-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
Valueable Contributors
Hamad Marri for the CacULE Scheduler
Archlinux for the great linux operating system