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NEON is the new black: fast JPEG optimization on ARM servers
Cloudflare's jpegtran implementation was optimized for Intel CPUs. Now that we intend to integrate ARMv8 processors, new optimizations for those are required.
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How a fix in Go 1.9 sped up our Gitaly service by 30x
After noticing a worrying pattern in Gitaly's performance, we uncovered an issue with fork locking affecting virtual memory size. Here's how we figured out the problem and how to fix it.
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IP addresses and routing
IP addresses & routing
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Doom as a tool for system administration (1999)
As I was listening to Anil talk about daemons spawning processes and sysadmins killing them, I thought, "What a great user interface!" Imagine running around with a shotgun blowing away your daemons and processes, never needing to type kill -9 again.
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24-core CPU and I can’t type an email – part two
In my last post I promised to give more details about some rabbit holes that I went down during the investigation, including page tables, locks, WMI, and a vmmap bug. Those details are here, along …
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What Is Systems Programming, Really?
I have a gripe with the phrase
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XARs: An efficient system for self-contained executables
Distributing large pieces of software to thousands of machines with a wide variety of configurations can pose a significant operational challenge, requiring a process to identify and copy precisely…
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Compiler bug? Linker bug? Windows Kernel bug
See the end of the post for an October 2018 bug fix update, or read the whole story: Flaky failures are the worst. In this particular investigation, which spanned twenty months, we suspected hardwa…
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Arcan versus Xorg – Approaching Feature Parity
This is the first article out of two where I will go through what I consider to be the relevant Xorg feature set, and compare it, point by point, to how the corresponding solution or category works…
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DNSFS – Store files in others' DNS resolver caches
A while ago I did a blog post about how long DNS resolvers hold results in cache for, using RIPE Atlas probes testing against their default resolvers (in a lot of cases, the DNS cache on their modem/router).
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Abusing Linux's firewall: the hack that allowed us to build Spectrum
Introducing Spectrum: a new Cloudflare feature that brings DDoS protection, load balancing, and content acceleration to any TCP-based protocol.Today we are releasing Spectrum.
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Amazon EKS – Now Generally Available
We announced Amazon Elastic Kubernetes Service (Amazon EKS) and invited customers to take a look at a preview during re:Invent 2017. Today I am pleased to be able to let you know that EKS is available for use in production form. It has been certified as Kubernetes conformant, and is ready to run your existing […]
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How the JVM compares strings on x86 using pcmpestri
We’ve all probably seen Java’s String comparison function before. It compares strings by the first differing character, falling back to the length difference when they are identical up to the end of the shorter string:
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Why has CPU frequency ceased to grow? (2014)
A portfolio of HPC tools help data scientists, researchers, and developers efficiently build cross-architecture applications.
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Things you must know before you can understand Meltdown as a developer
Meltdown is a cache-timing attack on Intel CPUs that allows all memory to be read by any process because of how they do Speculative Execution.
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The State of Atom's Performance
We are archiving Atom and all projects under the Atom organization for an official sunset on December 15, 2022.
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Windows NTFS Tricks Collection
In this blog post René Freingruber (@ReneFreingruber) from the SEC Consult Vulnerability Lab shares different filesystem tricks which were collected over the last years from various blog posts or found by himself.
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Jepsen: MongoDB 3.6.4
MongoDB is a long-time user of Jepsen . Over the past three years, Jepsen has performed several analyses for MongoDB, and MongoDB has integrated an expansive Jepsen test suite into their CI system. In March, MongoDB requested Jepsen perform an analysis on a previously untested configuration: sharded clusters. We also…
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Tearing apart printf()
How does printf work behind the scenes
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ReactOS 0.4.9 released
ReactOS is a free, opensource reimplementation of windows
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Caching Beyond RAM: The Case for NVMe
memcached
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Anna: A Fast, Scalable, Flexibly Consistent Key-Value Store
There’s fast and there’s fast. This post is about Anna*, a key/value database design from our team at Berkeley that’s got phenomenal speed and buttery smooth scaling, with an unpr…
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AirPods get stuck in low-quality 16 kHz audio mode when starting a VM
I always love when I find a really dumb solution that works reliably to fix a problem that should never really be a problem in the first place. But having worked with audio devices before—though nothing nearly as complex as the AirPods—I am willing to cut Apple some slack in building a seamless aural experience with…
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Effectively using AWS Reserved Instances
Learn how Stripe uses AWS Reserved Instances and capacity planning to effectively manage a dynamic, scalable cloud infrastructure.
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NetBSD 8.0 released
The NetBSD Project is pleased to announce NetBSD 8.0, the sixteenth major release of the NetBSD operating system.