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An interactive tour of the spanning tree protocol
Root election, port roles, proposals and agreements, topology changes: explore RSTP through simulations powered by MSTPD compiled to WebAssembly.
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The latest blog posts to take off on Hacker News. 6,942 posts.
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FreeBSD 14.5-Release
The FreeBSD Release Engineering Team is pleased to announce the availability of FreeBSD 14.5-RELEASE. This is the sixth release of the stable/14 branch.
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Leaving VMware just got harder after Broadcom pulled VDDK downloads
Broadcom pulled public VMware VDDK downloads, creating new challenges for customers migrating to Azure, Nutanix, OpenShift, KVM, and other platforms.
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Speculative Decoding in vLLM on AMD GPUs
A practical guide to speculative decoding in vLLM on AMD GPUs, covering draft-and-verify mechanics, MTP, EAGLE-3, DFlash, DSpark, configuration, tuning, and ben
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It took a year to ship WebAssembly in Anubis
After a year of work, hundreds of commits, 5 generations of pull requests, dozens of tests, rewriting part of Anubis in Rust, the first compiler bug of my career, and at least three times making my tower run out of ram I think I have finally done it. The next version of Anubis will ship with WebAssembly-based proof of…
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NetBSD 9.5 released and EOL for NetBSD-9
The NetBSD Project is pleased to announce NetBSD 9.5, the fifth (and final) release from the NetBSD 9 stable branch.
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Asahi Linux on M3
Porting Linux to Apple Silicon
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AMD Based FreeBSD Desktop Reloaded
My previous AMD Based FreeBSD Desktop is still up and running – it will now be my kids computer … so I needed a new one … but not a bigger one :) I spent way too much time finding…
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The NX bit is not just about security
While I’m taking a short break from low-level programming, here’s a story by a friend of mine, Sonya, about debugging a seemingly impossible bug in ARM code. This bug hunting saga started several months ago. While developing a bare-metal hypervisor on ARM64 for postmarketOS, I hit a strange bug: if I enabled the…
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Ok, but does it scale?
This is probably the question I get asked most about Spacetime. It’s a simple enough question, and it certainly seems like it should have a simple answer. Scaling is a complex topic, and the devil is…
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Simple Is Not Small
small programs hide coupling
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How to bring up the Linux Kernel on a new platform
A guide to bringing up the Linux Kernel and a userspace application on a new hardware (or in this case, a self-made emulator)
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Async Rust vs RTOS showdown (2022)
It's time for another technical blog post about async Rust on embedded. This time we're going to pitch Embassy/Rust against FreeRTOS/C on an STM32F446 microcontroller.
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Static Allocation, Constant Work
In reply to this email:
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The Two Abstractions of System Design: Hide or Reduce
When talking about TLA+, I keep referring to "abstraction" as the most important thing to learn . And it is about the hardest to learn as w...
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The browser's main thread is expensive
What comes to mind when you hear "frontend optimization"? For most of us it's things like reducing network requests, shrinking the bundle,…
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We could save petabytes of cache storage with Zstandard and Pingora
Could we get more cache space with the same hardware? We prototyped compression inside Cloudflare's cache to find out.
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Io_uring Without Readahead
Someone opened a PR to implement readahead in Turso. It was a throwaway implementation, but a good excuse to measure io_uring and understand more about it.
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Engineering of the fastest WebAssembly interpreters
The optimizations behind Wasmi 2.0, and how they compare to Wasm3 and Stitch.
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ReactOS 0.4.16
ReactOS is a free, opensource reimplementation of windows
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P99 0 ms* autocomplete for 240M domain names
How Wirewiki's domain-name autocomplete renders suggestions next frame for 99% of keystrokes.
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Haiku R1/beta6 has been released
After about two years since the last beta, and only about a week after Haiku’s 25th birthday, Haiku R1/beta6 has been released! See “Release Notes” for the release notes, “Press contact”, for press inquiries … and …
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Omarchy: Any User Process Can Escalate to Root
A security issue in Omarchy’s default Docker configuration meant that essentially every program running in the user’s desktop session could escalate to root without a password, sudo, or a privilege prompt. If you use Omarchy, the most important takeaway is simple: update to 4.0.1. I reported this issue privately…
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Building my own network stack
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Arbitrary code execution in QubesOS via copy-to-VM error reporting backchannel
We have published Qubes Security Bulletin (QSB) 118: Dom0 arbitrary code execution in qvm-copy-to-vm error reporting. The text of this QSB and its accompanying cryptographic signatures are reproduced below, followed by a general explanation of this announcement and authentication instru...
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Creepy Crawlies
You've probably heard me complain about the "AI crawlers" before, but now I actually have some hard numbers I can put up to show their im...
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Just the rumour of a bug is enough to find an exploit these days
Thinking through how the conventional OSS security embargoes no longer buy us time, and what open source maintainers might do instead to respond
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Don't use musl if you care about performance
I've spent most of my career working inside the JVM, with a sidebar of Python. So the first time I hit incompatible libc with containerized Bifrost, and GPT suggested musl as the solution, not only did I jump on it, I moved my other Rust projects to musl as