Lightnews — Scholar-powered news

Andrea Righi @arighi.bsky.social · 12d

virtme-ng v1.38 is out! This is a pretty stable update, bringing only bug fixes. Most notably, the infamous "Stale file handle" errors with virtiofsd are finally gone. If you've hit them before, you know how annoying they were, so time to update!

github.com/arighi/virtm...

1

Andrea Righi @arighi.bsky.social · 13d

It was a great honor to speak at @kernelrecipes.bsky.social again this year. This conference is always a rich source of inspiration, I'm going back home full of new ideas... and lots of work to do. :)

To all kernel folk: don't miss it next year! #kr2025

1 2 5

Reposted by Andrea Righi

Kernel Recipes @kernelrecipes.bsky.social · 14d

#kr2025 speakers team. Thanks for making this edition a great success again!

3 5

Reposted by Andrea Righi

Kernel Recipes @kernelrecipes.bsky.social · 16d

juming on the conclusion after nice aquarium demos. @arighi.bsky.social

1 2

Reposted by Andrea Righi

Kernel Recipes @kernelrecipes.bsky.social · 16d

@arighi.bsky.social to finalize this first day : Scheduling recipes
what the role of the scheduler, sched_ext project and interaction with BPF

kernel-recipes.org/en/2025/sche...

#kr2025

2 3

Andrea Righi @arighi.bsky.social · Aug 8

virtme-ng v1.37 has been released with the initial support for systemd. You can now test apps that depend on systemd inside the virtualized environment.

More info: github.com/arighi/virtm...

1

Andrea Righi @arighi.bsky.social · Jul 22

I'm excited to announce that the sched_ext microconference has been accepted for LPC 2025 in Tokyo - and the Call for Proposals is now open! #linuxplumbers

Dec 11–13 | Tokyo, Japan
Submit your topic: lpc.events/event/19/abs...
Details: lore.kernel.org/all/aH9NIL4C...

Linux Plumbers Conference 2025

The Linux Plumbers Conference (LPC) is a developer conference for the open source community. The LPC brings together the top developers working on the plumbing of Linux - kernel subsys...

lpc.events

2

Andrea Righi @arighi.bsky.social · May 19

I'm quite shocked to see a user-space Rust scheduler (rustland) competing and, in some cases, even outperforming other BPF or in-kernel schedulers.

Big shoutout to the @cachyos.org community for constantly running all these benchmarks! It's great motivation to keep improving!

3 4

Andrea Righi @arighi.bsky.social · May 4

May the 4th be with your kernel tests, virtme-ng v1.34 is out!

In this new release: vsock SSH support (more lightweight guest connections), a better support for the s390 architecture and the usual set of bug fixes and improvements.

github.com/arighi/virtm...

Andrea Righi @arighi.bsky.social · May 1

Thanks! bpfland is still slightly better overall (I'll share a comparison too), but what's exciting IMHO is the potential that user-space scheduling brings, before it was held back by overhead, now that performance is comparable to in-kernel schedulers, it can open the door to new cool experiments

1

Andrea Righi @arighi.bsky.social · Apr 30

I've decided to revamp my Linux kernel scheduler in Rust, re-designing and improving the BPF <-> user-space pipeline, and found some interesting benchmark results (from the Phoronix test suite). User-space scheduling feels even more viable now. More info: arighi.blogspot.com/2025/05/reva...

Revamping my Linux kernel scheduler in Rust

Recap Some time ago, I built a kernel scheduler in Rust, called scx_rustland . It runs entirely in user space, powered by sched_ext , a tec...

arighi.blogspot.com

1 1 1

Andrea Righi @arighi.bsky.social · Apr 11

Video of my talk at OSPM Summit 2025 on the current status and future plans for sched_ext:
www.youtube.com/watch?v=YxO4...

sched_ext: current status and future plans - Andrea Righi (OSPM25)

YouTube video by Retis Lab

www.youtube.com

1 2 3

Andrea Righi @arighi.bsky.social · Apr 10

Me blabbing and demoing the new NUMA-aware features in the scx_bpfland scheduler
youtu.be/CootF9OtSRM

#linux #scheduling #sched_ext #bpf

NUMA-aware scheduling with sched_ext and scx_bpfland

YouTube video by arighi_linux

youtu.be

2 6

Andrea Righi @arighi.bsky.social · Feb 26

virtme-ng v1.33 is available! Now you can run amd64 instances on non-x86 architectures (which means you can use arm64 as your kernel dev / testing platform with vng). Plus, more bug fixes and security improvements.

Check out the full changes here:
github.com/arighi/virtm...

1 2

Andrea Righi @arighi.bsky.social · Feb 15

Ubuntu 25.04 is now sched_ext ready arighi.blogspot.com/2025/02/ubun...

Ubuntu 25.04 is now sched_ext ready

Ubuntu 25.04 Plucky Puffin now ships a linux-generic kernel based on 6.12 , which means that sched_ext is supported out of the box! 🎉...

arighi.blogspot.com

1 1

Andrea Righi @arighi.bsky.social · Feb 13

And my other talk at FOSDEM 2025 "Level up your Linux gaming: how sched_ext can save your fps" is also out: ftp.fau.de/fosdem/2025/...

ftp.fau.de

3 9

Andrea Righi @arighi.bsky.social · Feb 13

Video of my talk at FOSDEM 2025 "Rust-ifying the Linux kernel scheduler (in user space)":

video.fosdem.org/2025/ub2252a...

There are some skips here and there in the recording, but they don't alter the content too much.

video.fosdem.org

1 2

Reposted by Andrea Righi

Phoronix @phoronix-poster.bsky.social · Feb 5

NVIDIA Engineer Talks Up sched_ext Linux Scheduler Possibilities At FOSDEM - https://www.phoronix.com/news/NVIDIA-Talks-Up-Sched-Ext

NVIDIA Engineer Talks Up sched_ext Linux Scheduler Possibilities At FOSDEM

Merged last year for the Linux 6.12 kernel was sched_ext for allowing extensible scheduler possibilities by allowing schedulers to be implemented as eBPF code and dynamically loaded into the kernel. This allows for rapidly developing new schedulers as well as exploring other new possibilities around more intelligent kernel scheduling decisions. Meta, Google, Canonical (Ubuntu), and others have been big proponents of sched_ext and NVIDIA is also increasingly vocalizing their support for these extensible scheduler opportunities...

www.phoronix.com

2 9

Andrea Righi @arighi.bsky.social · Feb 2

Day 2 at @fosdem.bsky.social - today talking about gaming on Linux and scheduling

fosdem.org/2025/schedul...

FOSDEM 2025 - Level up your linux gaming: how sched_ext can save your fps

fosdem.org

1 5

Andrea Righi @arighi.bsky.social · Feb 1

On my way to @fosdem.bsky.social to talk about Rust-ifying the Linux kernel scheduler fosdem.org/2025/schedul...

FOSDEM 2025 - Rust-ifying the Linux kernel scheduler (in user space)

fosdem.org

Andrea Righi @arighi.bsky.social · Jan 31

I'm happy to answer any sched_ext related questions and also show a live demo for those that are at FOSDEM 🙂

2

Andrea Righi @arighi.bsky.social · Jan 27

A short compilation of clips showing how sched_ext / scx_bpfland can mitigate the impact of background workloads and improve the gaming experience on Linux (featuring AAA games)

www.youtube.com/watch?v=ZuWy...

Gaming under pressure: enhancing the Linux gaming experience with sched_ext

YouTube video by arighi_linux

www.youtube.com

1 2 6

Andrea Righi @arighi.bsky.social · Jan 23

Video of my talk 'Designing Custom Linux Schedulers with sched_ext' for the Linux Foundation Mentorship Series. Hope you find it useful!

www.youtube.com/watch?v=jsLj...

Mentorship Session: Designing Custom Linux Schedulers with sched_ext

YouTube video by The Linux Foundation

www.youtube.com

4

Andrea Righi @arighi.bsky.social · Jan 18

Sharing some results of my experiments with sched_ext to speed up micro-VM boot time. A modified bpfland provides ~11% faster boot time than the default Linux scheduler. This doesn't make bpfland a better scheduler, but it shows the potential of sched_ext:
arighi.blogspot.com/2025/01/acce...

Accelerating micro-VM boot time with sched_ext

Overview Booting short-lived virtual machines (VMs) can be a highly CPU-intensive workload. In scenarios like serverless computing, where b...

arighi.blogspot.com

1 1

Andrea Righi @arighi.bsky.social · Jan 3

virtme-ng v1.32 is out with exciting new features, such as the remote (vsock) console and ssh support, so now you can attach to a running vng instance from another terminal or use ssh/scp!

github.com/arighi/virtm...

1