All you never wanted to know about creating fast socket I/O on #Linux. Unless you are a real geek.
A small, ultra-high performance publish-subscribe server doing kind of TCP #multicast using #sendfile, #io_uring, #splice, (mapped) files, and #fallocate for file hole punching.
Saturating a 10 Gbps link with useful data with just 8 cores.
A beautiful writeup for anyone into fast Linux networking. Not just for #ATproto
h/t @nohillside
#PubSub #Kernel #Hacking
https://www.asayers.com/jetrelay
Linux Developers want to remove i486 & i586 Pentium CPU Support to unburden Kernel Developers.
Linux is renowned for supporting incredibly ancient hardware, but there are limits to even what Linux developers can support. “Linux developers are finally proposing removing support for ancient i486 and early i586 Pentium CPUs to unburden developers.”
https://www.phoronix.com/news/Linux-RFC-Remove-i486-Early-586
![[ImageSource: Shutterstock]
Linux developers have considered removing i486 support as far back as 2022, but there now appears to be mounting pressure to execute those wishes. For reference, Linux dropped support for the i386 series in 2012, marking 13 years since the last time the Linux kernel discontinued support for a deprecated CPU series.
The i486 series is an ancient Intel CPU lineup that launched back in 1989, representing Intel's fourth generation of binary-compatible CPUs. The i486 introduced several key technologies, such as a large on-chip cache and an integrated floating-point unit, components that are used in almost every single modern CPU. Depending on the model, i486 chips took advantage of 1000nm down to 600nm process nodes, with clock speeds ranging from around 20 MHz to 100 MHz. Production of the last i486 chips was discontinued in 2007.
The i586 series, also known as Intel's first Pentium-branded processor lineup, succeeded the i486 series. The original Pentium, introduced in 1993, brought along improvements from the i486 series, including a dual-integer pipeline design and a more advanced floating-point unit. The first-generation Pentium [or P5] was built on an 800nm process with clock speeds ranging from 60 MHz to 66 MHz, depending on the model.](https://nerdculture.de/system/media_attachments/files/114/517/177/748/750/217/original/48b54d8b2e45e131.jpeg "[ImageSource: Shutterstock]
Linux developers have considered removing i486 support as far back as 2022, but there now appears to be mounting pressure to execute those wishes. For reference, Linux dropped support for the i386 series in 2012, marking 13 years since the last time the Linux kernel discontinued support for a deprecated CPU series.
The i486 series is an ancient Intel CPU lineup that launched back in 1989, representing Intel's fourth generation of binary-compatible CPUs. The i486 introduced several key technologies, such as a large on-chip cache and an integrated floating-point unit, components that are used in almost every single modern CPU. Depending on the model, i486 chips took advantage of 1000nm down to 600nm process nodes, with clock speeds ranging from around 20 MHz to 100 MHz. Production of the last i486 chips was discontinued in 2007.
The i586 series, also known as Intel's first Pentium-branded processor lineup, succeeded the i486 series. The original Pentium, introduced in 1993, brought along improvements from the i486 series, including a dual-integer pipeline design and a more advanced floating-point unit. The first-generation Pentium [or P5] was built on an 800nm process with clock speeds ranging from 60 MHz to 66 MHz, depending on the model.")
2/ Dave meanwhile suggested to "remove support for TSC-less and CX8-less CPUs" from the #Linux #kernel 6.17, but Ingo likely will send it in for #LinuxKernel 6.16:
"And since Linus asked for this and semi-acked it, I might try sending
this in this merge window […]"
Thank you very much for remembering our beloved Dave Taht, @mikrotik <3!
https://youtube.com/clip/UgkxNqoUv2HpVczWhdxkAdFJcgQKdjtsCETg?si=Ud_kzZHr3F-azqgX
#RFC8290 #FQ_CoDel #sch_CAKE #bufferbloat #latency #jitter #MikroTik
#DaveTaht #BandwidthIsALIE #OpenSource #FLOSS #WiFi #router #Linux #QoS #QualityOfService #HierarchicalTokenBucket #RouterOS #FQCoDel #schCAKE #routers #WiFirouter #LinuxKernel #Kernel
Support for 486-style CPUs is scheduled to be removed from #Linux according to lots of news sites. But the truth is that the relevant #kernel patches haven't even reached -next yet.
But yes, it likely will be removed. If for #LinuxKernel 6.16 or a later version remains to be seen.
Today things progressed again somewhat, as the second version of the removal patches were posted for review:
[PATCH -v2 0/15] x86: Remove support for TSC-less and CX8-less CPUs – https://lore.kernel.org/lkml/20250515085708.2510123-1-mingo@kernel.org/
Was Sie schon immer über #Hibernate & #Resume im #Linux-#Kernel wissen wollten, bisher aber nicht zu fragen wagten:
Diferencias entre el #scheduler de #linux y #bore el scheduler de #cahcyos
Reading this article by @stefano with great interest.
Many things can be learned here.
#Apple #iPhone #ClosedSource #OpenSource #iMac #Mach #kernel #SteveJobs
"' Understanding the [#Linux #kernel] error logs that AER [PCI Express Advanced Error Reporting] provides requires background which, hopefully, this article provided.
This is a lot to digest, so if there was one take-away message here, it would be that Correctable errors are not as scary as they seem. But it might be a good idea to keep an eye on them. Especially when their numbers start to spiral out of control.'"
https://blogs.oracle.com/linux/post/pci-express-advanced-error-reporting
Playing in my dmesg output again.
Since the miniPC has a broken GPU and CPU (APU one die) thanks to Gigabytes puny small APU fan, I seek messages to find more unstable things the kernel found so I can disable them,.
IPFire 2.29 Core Update 194:Tutte le novità del #firewall GNU/Linux con #kernel 6.12 LTS.
IPFire è una distribuzione GNU/ #linux specializzata, nata per offrire una soluzione firewall robusta, trasparente e libera, pensata per essere installata come sistema dedicato alla protezione delle reti informatiche.Il progetto nasce come derivazione di IPCop nel 2005,ma si è rapidamente evoluto in una piattaforma indipendente,con un sistema operativo continua a leggere... #ipfire2
https://www.laseroffice.it/blog/2025/05/13/ipfire-2-29-core-update-194-tutte-le-novita-del-firewall-gnu-linux-con-kernel-6-12-lts/
/* Don't even think about trying any of these in real life!!! The names includes "busted", and they really means it! The only purpose of these functions is to provide a buggy RCU implementation to make sure that rcutorture correctly emits buggy-RCU error messages. */
https://elixir.bootlin.com/linux/v6.14.6/source/kernel/rcu/rcutorture.c#L621-L627
#BSI WID-SEC-2025-0999: [NEU] [niedrig] #Linux #Kernel: Mehrere Schwachstellen
Ein lokaler Angreifer kann mehrere Schwachstellen im Linux-Kernel ausnutzen, um einen Denial-of-Service-Zustand herbeizuführen, Daten zu manipulieren und andere nicht spezifizierte Angriffe durchzuführen.
https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2025-0999
New Version: #Linux #Kernel 6.15-rc6 (mainline;All) https://www.kernel.org/
Finally found time to continue work on the Rockchip NPU. Plan to give this a strong push in the next few months:
https://blog.tomeuvizoso.net/2025/05/rockchip-npu-update-5-progress-on.html
What #unixlike operating systems do you know which are easy to port? Something like #NetBSD. I wonder if there is anything written in #commonlisp or #rust
There are some options but I'm not sure how much easy are they to port. I've heard many positive comments about bare metal development using Rust. I wonder how is common lisp in this regard.
I have extensive programming experience but not on bare metal or kernel programming.
Boosts for wider participation in the discussion are welcome.
// This is an evil hack, but it saves a lot of duplicated code.
https://elixir.bootlin.com/linux/v6.14.6/source/sound/pci/au88x0/au88x0_pcm.c#L618
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