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New
The latest blog posts to take off on Hacker News. 582 posts.
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Freenet build 1495: new user experience and performance
Hyphanet is a peer-to-peer platform for censorship-resistant communication and publishing.
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Encrypted DNS and NTP = Deadlock
I recently found out the hard way that encrypted DNS can deadlock with NTP on embedded devices without a battery-backed clock.
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Austral: A systems language with linear types and capabilities
Introducing a new programming language.
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Ventura Issues
I’m more surprised by the nature of many of these issues, by how ridiculous they are compared with the sheer age and supposed maturity of a 20+ year-old operating system.
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Using eBPF and predefined inspections to minimize “observability tax”
Learn how Coroot uses eBPF and predefined inspections to achieve fast, code-free monitoring with minimal observability overhead.
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The Reliability Trap: The crash of Emirates flight 521 (2020)
On the 3rd of August 2016, an Emirates Boeing 777 landing in Dubai attempted a last second go-around after touching down too far along the…
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Nix on the Steam Deck
When I first started using Linux in 2006, I remember dreaming of a Linux Console. It wasn't so far fetched, the PlayStation 3 had just been released with OtherOS support which allowed users to install Linux (or BSD). Still, it seemed that a Linux-first console seemed like it would only ever be a dream.
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Linux Kernel Ksmbd Use-After-Free Remote Code Execution Vulnerability
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability, but only systems with ksmbd enabled are vulnerable.
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Docker on MacOS is slow and how to fix it
Note 05/01/2025: Hello there, you can find an update version of this article here, with the latest findings, improvements and new tools. This is how a Docker container feels inside a macOS environment: lost at sea, far from the coast. With this article I will try to bring this poor container safely to the coast. TL;DR…
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Avoid exception throwing in performance-sensitive code
There are various ways in software to handle error conditions. In C or Go, one returns error code. Other programming languages like C++ or Java prefer to throw exceptions. One benefit of using exceptions is that it keeps your code mostly clean since the error-handling code is often separate. It is debatable whether…
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Netflix: 30% bitrate saving using Film Grain Synthesis
Searchable archive of articles, posts and press on video denoising, per-shot encoding, AV1 film grain synthesis, MXL and broadcast AI.
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This year in LLVM
Towards the end of last year, I switched from working on PHP at JetBrains, to working on LLVM at Red Hat. While it was already under discussion beforehand, this catalyzed the creation of the PHP foundation , which now pays multiple people to work on PHP. Special thanks for this go to Roman Pronskiy, who did most of…
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Upgrading my old Chumby 8 Linux kernel
As I mentioned in my last post, I spent a good chunk of my spare time over the past 6 months working on a project I’ve been thinking about for over a decade. I bought a Chumby 8 in 2011. It’s an 8″ touchscreen device powered by the Marvell PXA166 processor. It is essentially a souped-up digital picture frame with…
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Implementing ‘strlen’ using SVE
In C, the length of a string in marked by a 0 byte at the end of the string. Thus to determine the length of the string, one must scan it, looking for the 0 byte. Recent ARM processors have a powerful instruction set (SVE) that is well suited for such problems. It allows you … Continue reading Implementing ‘strlen’…
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Fast memcpy, a system design
When I worked at Google, fleet-wide profiling revealed that 25-35% of all CPU time was spent just moving bytes around: memcpy, strcmp, copying between user and kernel buffers in network and disk I/…
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GNU/Linux shell related internals
What every SRE should know about GNU/Linux shell related internals: file descriptors, pipes, terminals, user sessions, process groups and daemons # Last updated: Oct 2025 Contents File descriptor and open file description Pipes Process groups, jobs and sessions Terminals and pseudoterminals Despite the era of…
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Why doesn’t Windows use 64-bit virtual address space below 0x00000000`7ffe0000?
It does use it, although it doesn't look like it.
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Get root on macOS 13.0.1 the macOS Dirty Cow bug
Get root on macOS 13.0.1 with CVE-2022-46689 (macOS equivalent of the Dirty Cow bug), using the testcase extracted from Apple’s XNU source.
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The $8 Linux Computer
Yes, you read that right... for $8 you can run linux on a RISC-V computer. And not just a stripped down kernel without an MMU. No, t...
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The strange case of BeOS, SRS and the silent Power Mac 6500
Tonight's story time: the Power Macintosh that wouldn't make any sound in BeOS R5, how I figured out the problem, and how I hacked the sound...
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I almost failed to search a 37 GB text file in under 1 millisecond
... in which we check if your password has been compromised in many inconvenient ways, in a tale of destruction, obsession, and self-discovery.
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A Linux Evening
I love to have Linux as my main OS. For someone who spends most of his time programming, writing HTML, writing LaTeX, and browsing the net, it is nearly a perfect tool. Packages are one "apt install" away. Mounting my website is one sshfs away and with private key authentication I don't even have to type my password…
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Userspace isn't slow, some kernel interfaces are
Discover how recent improvements to wireguard-go boost Tailscale client performance on Linux. Learn about key changes, testing methods, and results showing enhanced throughput and efficiency.
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Linux Desktop Environments System Usage
Over the years I've seen a lot of poorly made comparisons of Linux Desktop Environments in terms of system usage and in this article I want to make things right once and for all.
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Fuzzing ping(8) and finding a 24 year old bug
FreeBSD had a security fluctuation in their implementation of ping(8) the other day. As someone who has done a lot of work on ping(8) in OpenBSD this tickled my interests.