"Nest" Is An Interesting New Take On Linux Kernel Scheduling For Better CPU Performance

[yump]

It literally un-does everything retpoline is supposed to do. That's where the performance increase comes from.

Wat? This is about how the kernel chooses which CPU to wake up threads on.

[ptr1337]

Patch seems now to work on Intel Single Socket machines also.
A version based against 5.19 you can find here:

https://github.com/CachyOS/kernel-patches/blob/master/5.19/sched/0001-NEST.patch

[Kjell]

Volta Is it possible to try this alteady today, e.g. in Arch Linux?

[ptr1337]

Volta Is it possible to try this alteady today, e.g. in Arch Linux?

Hi,

sched-ext implented NEST as an example scheduler into their source:

https://github.com/sched-ext/sched_ext/commit/c8380be5834cd1bd03934a12f584a477a6475b92

I have updated the AUR linux-sched-ext-git AUR package:

https://aur.archlinux.org/cgit/aur.git/commit/?h=linux-sched-ext-git&id=0b1deb60ec2f123d68dfcb7b3a5d9fe646c3518a

So, just run:

paru -G linux-sched-ext-git
cd linux-sched-ext-git
makepkg -si

This will also compile the example schedulers and install them into

/usr/bin

.

After booting into the kernel, you can run the example scheduler with following command:

sudo scx_nest

You can also modify some values, check out

scx_nest --help

for help

Edit:
I don't know whats up with the phoronix servers, but it is crazy how slow pages are loading.
Sometimes the page does just crash after 1-2 Minutes trying to load the content. Sometimes cloudflare throws a server error. And these issues are very often.
You really should consider a network/server upgrade phoronix