1. Optimizing hash table with kmod as testbed

    One thing that caught my interest lately was the implementation of hash tables, particularly the algorithms we are currently using for calculating the hash value. In kmod we use Paul Hsieh’s hash function, self entitled superfast hash. I fell troubled with anything that entitles itself as super fast, especially given the benchmarks provided are from some years ago, with older CPUs.

    After some time spent on benchmarking and researching I realized there were much more things to look after than just the hash function. With this post I try to summarize my findings, showing some numbers. However do take …

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  2. Speeding up build on autofoo projects

    First of all, a little digression about build systems.

    I’d like to clarify that I’m no lover of autotools. But I’m no lover of any other build system, neither, and autotools is used on several open source projects, including most of the ones I participate. It’s easily copied and pasted by new projects. It’s known by distro maintainers how to hack on it to work on different scenarios like cross-compilation, distribute build across machines, different compilers, rpath, etc etc. Moreover, from my experience, project maintainers usually dislike changing the build system because it causes several …

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  3. Analyzing chess.com tournaments

    This year at ProFUSION we started to create chess tournaments to play using chess.com so we have fun not only coding but playing this game. However it’s even more fun when we put both together: chess and code :-)!

    During the second tournament we realized chess.com was missing a nice feature: to allow participants to predict who would be the champion based on the current championship status and future results. To show the current state, Chess.com presents us with a table like this:

    Not the missing games with a “_”. What we would like is to predict …

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  4. Back from Linux Plumbers

    I’m back from USA after one week attending Linux Plumbers Conference. This was my first time in LPC, in which I was part of the CoreOS, talking about “From libabc to libkmod: writing core libraries”.

    It was a very good experience and I’m glad to meet so many developers, both kernel and userspace hackers. Some of them I only knew from IRC, mailing-lists, etc and it was great time to share our experiences, discuss the current problems in Linux and even fix bugs :-). We seem finally to have reached a consensus on how module signing should be done …

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  5. ConnMan in Archlinux

    For sometime (I think it’s almost 2 years) I was maintaining the ConnMan package in AUR, the user repository in Archlinux.

    After talking to Dave Falconindy and Daniel Wallace, the later accepted to maintain it in community repository. As a result I’m dropping the package in AUR. All of you that were using my package should upgrade to the latest version from the official Archlinux repository.

    A great news is coming for Enlightenment users, too: a new ConnMan module, written from scratch, that works properly with recent versions. This is reaching e-svn very soon. Stay tunned. Thanks to …

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  6. BlueZ to move to standard D-Bus interfaces

    During the last week I was in Recife, Brazil, together with Henrique Dante, Ulisses Furquim and other fellows attending the BlueZ meeting. We discussed several topics, among them the upcoming BlueZ 5 API. That discussion started by Johan and Marcel saying BlueZ would not move to DBus.Properties and DBus.ObjectManager anymore for the next version. Main reason being that BlueZ now will have more frequent releases than it had in past and therefore there wasn’t enough time to convert the API. However I and Luiz von Dentz already had an almost working solution: I implemented DBus.Properties and …

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