Christian Svensson

@blueCmd

SRE. Love learning stuff. See what I'm hacking on @ . Into both hardware and software. Sometimes I blog at .

Vrijeme pridruživanja: travanj 2009.

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  1. proslijedio/la je Tweet
    prije 7 sati

    Today, let's take apart one end of a 10Gbps Ethernet Direct Attach Copper cable!

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  2. prije 14 sati

    For some reason the diagrams look misaligned on GitHub, looked much better in vim - oh well, some things are just hard in computing I guess! :-)

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  3. prije 15 sati

    Next I want to see how I can move this to Rust for s390x, and then add support for 3215 console and possibly (although unlikely) SCLP console.

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  4. prije 15 sati

    I started to dig into the z architecture a bit more and wanted to start by learning about IPL and my good friend the Disabled Wait state. I made a program that when IPLd straight goes into Disabled Wait, and tried to document everything in the process. See

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  5. proslijedio/la je Tweet
    Odgovor korisnicima i sljedećem broju korisnika:

    The words you’ll hear will be: Kicking and screaming. As in “I will drag the rest of this industry in the right direction kicking and screaming”

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  6. 2. velj

    Shout-out to the Observability track who seems to do this right. People forced to stay for Q&A, 15 min between talks so plenty of time to exit and get seats. Good job et al

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  7. 2. velj

    It's really a shame that moderators do not stop people from exiting and entering during the Q&A. It ruins the talk by not being able to have a dialog as any sound is drowned in people talking and walking.

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  8. proslijedio/la je Tweet
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  9. 23. sij
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  10. 22. sij

    Instead of doing this behind closed doors I figured I'd write up what I have and what doesn't work for interested people to have a look. . If anyone has any idea how to do this correctly, I'm all ears!

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  11. 22. sij

    Now with my DS6800 up and running finally, I took a stab at generating my IOCDS - it works with a single PATH= and LINK= but I'm scratching my head how I can express a fan-out scenario (e.g. mainframe has 1x 8G FICON out, switch has 4x 2G out).

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  12. 21. sij

    A bit of a long-shot, but I'm trying to find what IC these somewhat unique looking BGAs belong to. I'm pretty sure they are PCI-X related, but I don't know for sure. Anyone used to design cards when PCI-X was around and recognize the pads?

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  13. 19. sij

    they are more invested in Rust than Go. The goal of using Golang was to encourage contributions, as it is a more approachable language. But if a company staffs up and maintains a Rust BMC that seems like another way to solve that problem. Thoughts and ideas are welcome! 2/2

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  14. 19. sij

    I've been thinking on where to go next with u-bmc. Given that motherboard adoption and corporate sponsorship has been challenging, I'm quite interested to see what end up doing. I'm pretty sure we're aligned on the vision for what BMCs should be, however 1/2

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  15. 17. sij

    In the meantime I'll use this as a reference for Fejkon and continue the development there. I'm happy to know that this avenue exists though for future work.

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  16. 17. sij

    PoC'd! Linux on VMware ESXi with QLogic QLE2562 card providing 3590-style tape drives for a z/VM system over native FICON. This implementation I'm basing this on is very bound to just tapes however, but if somebody is up for some serious reverse engineering any FICON should work.

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  17. 16. sij

    This is a helpful reminder why you shouldn't accept the cost of running a distributed system before you need to. A single machine can be really fast if you let it.

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  18. proslijedio/la je Tweet
    16. sij

    and I will be representing at the 2020 Global Summit We plan to get involved both as a producer and as a consumer of open-source software, firmware, and hardware. Let me know if you want to meet!

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  19. 15. sij

    Apparently the Dell/EMC DLm2100 and newer uses normal QLogic QLE2562 FC cards to speak FICON. Looks like it uses a special firmware and possibly different interface. This might be cool to look into more.

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  20. proslijedio/la je Tweet
    13. sij

    🚨 New On the Metal episode w/ 🚨 Join us as we discuss impossible bugs, fires in the data center, reverse engineering BMC firmware, BMC vulnerabilities, Cray computers, and Windows NT on MIPS. Yup you heard that right!

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