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XXH3 – a new speed-optimized hash algorithm
xxh3 XXH3 - a new speed-optimized hash algorithm The xxHash family of hash functions has proven more successful than ...
Top posts
Every blog post that took off on Hacker News, ranked by the votes of its best submission. 4,387 posts.
962
You Got Your Web Browser in my Compiler
I recently discovered that Microsoft’s VC++ compiler loads mshtml.dll – also known as Internet Explorer. The compiler does this whenever the /analyze option (requesting static code analysis) is use…
963
Parallel Sequential Scan is Committed to PostgreSQL 9.6
I previously suggested that we might be able to get parallel sequential scan committed to PostgreSQL 9.5. That did not happen. However, I...
964
Making CRDTs More Efficient
State-based CRDTs grow monotonically, but that doesn't mean they can't be efficient. We'll learn how to compress the pixel editor state by 98%.
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Why the EAX register of x86 is called that
Usually, x86 tutorials don’t spend much time explaining the historical perspective of design and naming decisions. When learning x86 assembly, you’re usually told something along the lines: Here’s EAX . It’s a register. Use it.
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Those Win9x Crashes on Fast Machines
It is well known that Win9x variants prior to Windows 98 have a tendency to crash on fast CPUs. The definition of “fast” is of course fuzzy but the problems were known to occur on AMD K6-2 processors running at 350 MHz or faster as early as 1998. This led to some acrimony when Microsoft attempted to charge $35 for the…
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How I Found a 20-Year-Old Linux Kernel Bug
Robert O'Callahan. Christian. Kiwi. Software guy. All content human-authored unless otherwise noted.
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Syslog: Complete System Administrator Guide
Complete Guide on understanding the Syslog protocol, syslog message format as well as log forwarding. Best practices included!
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My Fanless OpenBSD Desktop
After the disappointment of my X1 Nano and learning that all future Intel "Evo"-branded laptops would lack S3 suspend, I started thinking about returning to my M1 MacBook full-time or building an OpenBSD desktop. I chose the latter, building my first desktop machine in many years.
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The Forgetful CPU (Linux on M4)
This blog post goes into quite some detail about how I first booted Linux on my M4 Mac mini. I encourage you to look up terms and concepts you don’t know, since I cannot explain all the background in this post ;)
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The power of interning: making a time series database smaller
This week-end project started by browsing the open-data repository of Paris’ public transport network, which contains various APIs to query real-time departures, current disruptions, etc.The data reuse section caught my eye, as it features external projects that use this open data.In particular, the RATP status…
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Suicide Linux
You know how sometimes if you mistype a filename in Bash, it corrects your spelling and runs the command anyway?* Such as when changing directory, or opening a file. I have an idea: Suicide Linux. Any time - any time - you type any remotely incorrect command, the interpreter cr...
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M1 Thunderbolt ports don’t fully support USB 3.1 Gen 2
It’s limited to 5 Gb/s, giving read rates of about 400 MB/s and writes at about 430 MB/s. Fine for Time Machine backups, but bad with NVMe drives.
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Networking changes coming in macOS 27
We are under warning that macOS 27 is likely to remove support for AFP, and lately some additional requirements for connection to certain servers. This explains how these could affect you.
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Fish shell 2.0
fish 2.0 is now released! fish is a fully-equipped command line shell (like bash or zsh) that is smart and user-friendly. fish supports powerful features like syntax highlighting, autosuggestions, and tab completions that just work, with nothing to learn or configure.
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How FoundationDB works and why it works (2021)
FoundationDB is a very impressive database. Its paper won the best industry paper award in SIGMOD’21. In this post, I will explain, in detail, how FDB works and discuss a few very interesting design choices they made. It’s a dense paper packed with neat ideas. Many details (sometimes even proof of correctness) are not…
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Addressing the adding situation
We learn why adding on x86 isn't as obvious as you might think
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Apple Silicon Hardware: SPRR and Guarded Exception Levels (GXF)
Over a year ago siguza published a write-up about Apple’s APRR - a custom ARM extension that redefines pagetable permissions and protects certain parts of the kernel from itself. Since then Apple has released their M1 chip which not only features an updated version of APRR but also easily allows to run bare-metal code…
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Implementing a distributed key-value store on top of implementing Raft in Go
Implementing the Raft distributed consensus protocol in Go
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Zeroserve: A zero-config web server you can script with eBPF
zeroserve is a small, fast, zero-config HTTPS server. You hand it a tarball of a website and it serves it - over HTTP/2 and TLS 1.3, with hot reload and a tiny resident footprint. The twist is that you can drop eBPF programs into the tarball and they run on every request, in userspace, as sandboxed middleware …
988
Oxide on My Wrist: Hubris on PineTime was the best worst idea
In my last Oxide-related post I got Oxide’s Propolis software running and said I might try and get their sled agent up and running next. Anyways that didn’t happen. Instead I ended up reading datasheets, writing rust codegen, spending 16 gigs of ram for an hour to build docs for a crate that’s just a glorified bundle…
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Ethereum has blobs. Where do we go from here?
On March 13, the Dencun hard fork activated, enabling one of the long-awaited features of Ethereum: proto-danksharding (aka EIP-4844 , aka blobs). Initially, the fork reduced the transaction fees of rollups by a factor of over 100, as blobs were nearly free. In the last day, we finally saw blobs spike up in volume and…
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Why Does Windows Really Use Backslash as Path Separator?
More or less anyone using modern PCs has to wonder: Why does Windows use backslash as a path separator when the rest of the world uses forward slash? The clear intermediate answer is “because DOS and OS/2 used backslash”. Both Windows 9x and NT were directly or indirectly derived from DOS and OS/2, and certainly…