31. May 2016 · Comments Off on The end of the thundering Hurd · Categories: The Hurd

It’s 2016, and the Hurd project is still alive. Barely, as a bunch of only three to five people “regularly” contribute, but it is alive. And it’s making progress. More »

14. May 2016 · Comments Off on Let’s Encrypt · Categories: Computing

As a tech geek, I’m quite sensitive to a current trend that aims at pushing the Web towards globally encrypted communications. My main problem with this idea was trust in certificate authorities, and as a result, I ended up being my own CA, which only a few people could trust. More »

26. September 2014 · Comments Off on Automated X15 builds – take 2 · Categories: X15

Well, Buildbot didn’t turn out well. Quality is too low for my taste, so I decided to switch to another one, namely Jenkins. And for now, despite not being very fond of Java applications, I’m quite satisfied. It supports the basic features I was looking for (automatic building, decent configuration power, a nice web interface, users and rights management, IRC notifications), but I was also surprised by multi-configuration builds, which fit perfectly with my needs.

20. September 2014 · Comments Off on Automated X15 builds · Categories: X15

Despite being small, X15 already supports quite a few configurations, such as i386 (32-bits x86, with or without PAE), amd64 (also known as x86_64) and a bunch of test modules. It’s very likely to support more in the future, so I decided to take some time and try Buildbot, a continuous integration framework, to automate builds with varying options. A link to the web interface is now in the main menu bar of the web site.

20. September 2014 · Comments Off on Scalable reference counters in X15 · Categories: X15

The new sref module provides scalable reference counters, implemented as described in the RadixVM paper (3.1 Reference counting with Refcache). Weak references aren’t supported, since I’m not sure they’ll actually be needed, but it’s already realtime-friendly, as all critical sections implemented by disabling preemption are constant-time and short, and also dyntick-friendly, by tracking which processors actually participate in reference counting, without the need to regularly wake idle processors to function. Along with per-processor page tables, this was the last major step towards revamping (and completing) the virtual memory system.

15. September 2014 · Comments Off on Iceweasel 31 on Debian GNU/Hurd · Categories: The Hurd


For some reason, the system has become more unstable recently. I’ve seen it freeze as soon as swapping memory out. I suspect it’s because of recent changes on the ext2 file system. These changes are good but they expose existing bugs we didn’t suffer from in the past. In order to cope with that, I’ve been using a kernel with no VM object cache, and completely synchronous file system accesses.

03. September 2014 · Comments Off on Per-CPU variables in X15 · Categories: X15

As I started working on a Refcache prototype (Refcache being a scalable reference counting scheme introduced in the RadixVM paper), tests run with little physical memory (currently 6 MB, could be less but Grub seems to require that much) started to fail. The introduction of the delta caches blew the size of the bss section up by about 10 MB, for only 32 processors at most. It was time to provide real support for percpu variables, at least those that are statically allocated.