CiotBSD
Peter N. M. HansteenSelectively block cores from the scheduler with sysctl hw.blockcpu https://www.undeadly.org/cgi?action=article;sid=20260415050032 #openbsd #sysctl #hw.blockcpu #blockcpu #development #performance #smt #smt #smp #multicore
Delayed hibernation comes to OpenBSD/amd64 laptops https://www.undeadly.org/cgi?action=article;sid=20260312185620 #openbsd #amd64 #laptops #hibernation #suspend #powermanagement #sysctl #freesoftware #libresoftware
Julien RiouBrilliant idea of systemd to apply sysctl settings from configuration files ignoring their folders and the Debian Kernel team to put defaults in a "/usr/lib/sysctl.d/50-default.conf" file.
Why 50 and not 00? I have all my settings in a "/etc/sysctl.d/10-custom.conf" file. One of them was mysteriously erased by those defaults in a file starting with a higher name hidden in the system files.
Now I understand why all configuration files are prefixed by "zzz".
N-gated Hacker News✨🤦♂️ "vm.overcommit_memory=2 is *always* right!" proclaims the oracle of server wisdom, touting the magic #sysctl that will solve all memory woes. Because, of course, who needs nuanced memory management when you can just hope for the best? 😜✨
https://ariadne.space/2025/12/16/vmovercommitmemory-is-always-the-right.html #vmovercommit_memory #memorymanagement #serverwisdom #techhumor #ITjokes #HackerNews #ngated
https://ariadne.space/2025/12/16/vmovercommitmemory-is-always-the-right.html #vmovercommit_memory #memorymanagement #serverwisdom #techhumor #ITjokes #HackerNews #ngated
vm.overcommit_memory=2 is always the right setting for servers
The Linux kernel has a feature where you can tune the behavior of memory allocations: the vm.overcommit_memory sysctl. When overcommit is enabled (sadly, this is the default), the kernel will typically return a mapping when brk(2) or mmap(2) is called to increase a program’s heap size, regardless of whether or not memory is available. Sounds good, right? Not really. While overcommit is convenient for application developers, it fundamentally changes the contract of memory allocation: a successful allocation no longer represents an atomic acquisition of a real resource.
steveFixing delayed syncing with Linux Nextcloud client – Lennart’s weblog
Recently, I noticed that changed files were not picked up by the Nextcloud client as fast as before. As a result I sometimes missed a file (or changes in a file) on my laptop that had been created …
Source: Fixing delayed syncing with Linux Nextcloud client – Lennart’s weblog
Alfonso Sicilianonsysctl 2.2 is out!
New features and improvements:
https://alfonsosiciliano.gitlab.io/posts/2025-06-28-nsysctl-2-2.html
Manual and tutorial already updated!
#documentation #docs #manual #tutorial
Port update in progress sysutils/nsysctl
#FreeBSD #UNIX #sysadmin #sysctl #HappyHacking #runbsd 
#OpenSource
🖥️ My ultra-budget server powering http://websysctl.alfonsosiciliano.net has been running smoothly for the past 2 months. So far, so good!
📈 #Crawlers hit tens of thousands of sysctl parameter pages daily. That's fine, since robots.txt allows it. But why keep requesting non-existent pages as if the site were built with WordPress 😤 ? Fortunately, the stack (#FreeBSD 
+ #OpenResty 🌐 + #Lapis ✏️ + a custom-built #database 📦 ) stays well within the limited resources of my $5/month cloud server.
The code might soon be #OpenSource stay tuned!
#UNIX #sysctl #WebDev #WebServer #ThePowerToServe #coding #Lua #kernel
sysctlview https://www.freshports.org/deskutils/sysctlview/ is a GUI utility for sysctl on #FreeBSD.
It's probably my first #opensource project 👨💻 , it's still in the Ports Collection 📦 and runs fine, but it hasn't been updated in years.
Maybe it's finally time to brush up on #C++ and give sysctlview a proper rewrite.
The original version uses #gtkmm (#GTK for C++), but a few years ago I ran a poll and most people preferred #qt
So maybe a QTsysctlview is on the horizon? 👀
#staytuned #sysctl #FreeBSDDev #coding #kernel #Desktop #Laptop
SysctlTUI is Out!
The sysctl() system call can get or set the state of the system, the #FreeBSD kernel exposes the parameters for sysctl() as objects of a Management information Base (MIB).
sysctltui is a Text User Interface #sysctl #MIB explorer. It allow to view a parameter’s properties and get or set its value.
Link: https://alfonsosiciliano.gitlab.io/posts/2025-05-29-sysctltui.html
