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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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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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Installing Every Arch Package
Using algorithms and Julia to install as many packages as possible from the Arch Linux official repositories
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Testing Distributed Systems
Curated list of resources on testing distributed systems
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Linux: What Can You Epoll?
On Linux what can you turn into a file descriptor and then monitor with epoll?
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What is triald and why is it taking so much disk space?
Is a process named triald stealing lots of CPU? Or maybe ~/Library/Trial is huge, or filling your backups? Maybe it’s all just one of Apple’s Experiments.
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Life at 800 MHz
We’ve been using a Sony Vaio VGN-P588E for the past few months as our primary personal laptop. This thing’s great; it’s got a small but not uncomfortable keyboard. It’s got a trackpoint, which we absolutely need to keep our hands healthy. Crucially, it’s only 1.5 pounds. We’re disabled in a way that means we’ve got to…
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Linux boot partitions and how to set them up
Posts and writings by Lennart Poettering
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Debian and firmware
TL;DR : firmware support in Debian sucks, and we need to change this. See the "My preference, and rationale" Section below.
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The DynamoDB Paper
This week at USENIX ATC’22, a group of my colleagues 1 from the AWS DynamoDB team are going to be presenting their paper Amazon DynamoDB: A Scalable, Predictably Performant, and Fully Managed NoSQL Database Service . This paper is a rare look at a real-world distributed system that runs at massive scale.
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Problems with “graceful shutdown” in Kubernetes (2019)
Grace is overrated
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The true cost of linked lists
Linked lists are often overused in introductory algorithmics courses, due to a heavy focus on theorical complexities. Unfortunatly, in practice, computers are complex beasts. They don’t execute instructions sequentially 1 with the same cost 2 . This means that a data structure with faster theorical complexities does…
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macOS now scans for malware whenever it gets a chance
How macOS now has anti-malware scanners checking your Mac automatically many times each day for the most frequent malware.
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PostgreSQL query performance bottlenecks
PostgreSQL query planner is full of surprises, so a common-sense approach to writing performant queries is sometimes misleading. In this blog post, I'll describe examples of optimizing seemingly obvious queries with the help of EXPLAIN ANALYZE and Postgres metadata analysis.
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Amazon’s distributed computing manifesto (1998)
Today, I am publishing the Distributed Computing Manifesto, a canonical document from the early days of Amazon that transformed the architecture of Amazon's ecommerce platform. It highlights the challenges we were facing at the end of the 20th century, and hints at where we were headed.
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Please restore our registers when you’re done with them
“Hey, you. Yes you, that function over there. When you’re cleaning up please remember to restore all of my registers. Yes, that one too – what do you think this is, Linux?”That’s the problem I was …
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Hardware-accelerated Linux virtual machines on jailbroken iPhone 12 / iOS 14.1
I unlocked Hypervisor.framework on my jailbroken phone and modified UTM, a popular QEMU port for iOS, to run arm64 Linux in a VM at full native speed. …for the clickbait - and to show iPhone’s untapped potential.
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Linux NILFS file system: automatic continuous snapshots
In this article, I present the Linux file system NILFS and its automatic continuous snapshoting system.
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Random number generator enhancements for Linux 5.17 and 5.18
The random number generator has undergone a few important changes for Linux 5.17 and 5.18, in an attempt to modernize both the code and the cryptography used. The smaller part of these will be released with 5.17 on Sunday, while the larger part will be merged into 5.18 on Monday, which should receive its first release…
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Hello, Youki
First release of youki, an OCI container runtime written in Rust