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Cake day: April 13th, 2024

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  • Peter Magyar was even in Victor Orban’s Party “Fidesz”, and formerly the husband of Orban’s Justice Minister Judit Varga. Then two years ago there was a schism over a pardon of someone who covered up child abuse.

    His new party “Tisza” is conservative, centre-right, but also pro-European and anti-corruption. I hope it wasn’t a mask that drops soon, but I don’t know enough about their politics, to say much.



  • I think kids are always excited by new stuff, and if it’s big or complex stuff the excitement generally increases accordingly. Buses, trams, excavators, trains, planes, firetrucks, road rollers, cranes. And then as they get used to them the excitement either subsides, or it just keeps getting more and more specific.

    So for a European kid who at some point starts traveling by train regularly, it either subsides quicker, or it has more of a chance to get specific, because they start noticing the differences between the trains they use, and possibly the tracks if they use multiple kinds. This eventually results in lots of train nerds among grown ups.

    By the way, now I’m wondering, is the hobby of building and maintaining and running model trains on model tracks in a fixed installation at home common in the USA? I know at least three people who do that here in Switzerland, it’s not like sports or something, but for the large effort it still seems relatively common to me.

    One colleague at work has all the train models ever used by Rhätische Bahn in his collection now. That’s a regional train company that only serves mountainous regions by way of narrow (1m) tracks in one corner of Switzerland, but it’s still a big collection.




  • She answered that in her blog post that the Phoronix article links to:

    Which GPUs does this work with? Is it only AMD GPUs?

    Whether or not your GPU can benefit from it depends on the kernel driver - more specifically, whether it sets up the dmem cgroup controller.

    amdgpu and xe both have support for the dmem cgroup controller already. In theory, Intel GPUs running the xe kernel driver should benefit as well, although I’m not sure anyone tested this yet.

    For nouveau, I have sent a patch for dmem cgroup support to the mailing lists. This patch is also included in my development branch, so if you use my AUR package it should work. In other cases, you will need to wait for the patch to be picked up by your distribution, or apply it yourself.

    The proprietary NVIDIA kernel modules do not support dmem cgroups yet, so this won’t work there.








  • I’ve been thinking more about this: It seems unlikely they will ever provide a significant portion of intercontinental traffic, even if there is some latency benefit. The fundamental issue is one of bandwidth. You can stuff fiber optics full of data in ways most lay people wouldn’t believe. Using different frequencies you can put many data channels parallel. 88 x 200 Gigabit/s per fiber is no issue at all with components we bought 5-10 years ago already for our use case on land, and spectral efficiency is still getting better. A typical subsea cable will have around 8 fiber pairs, so 8 x 88 x 200 G in both directions for one cable is probably normal.

    The intersatellite links on Starlink satellites are reportedly also at 200G, and there are three of them on there, but intended to go to different neighbors I think. I’m not familiar with the specifics of free space optics, but I expect both wavelength division multiplexing and space division multiplexing will be much harder.

    So only applications where latency is really critical will probably be able to buy into that limited intercontinental bandwith. High frequency trading maybe. And then diplomacy and military, where the tapping resistance plays a bigger role than the latency.



  • Geostationary satelites at 38000±2000km distance take around 125ms up and the same back down for about 250ms for you to reach a server, maybe you were thinking of that. My uncle has that on his farm in Australia. It’s bad, you can’t have a good IP based phone call because the delay is too long, people keep starting to talk at the same time.

    Starlink flies in low earth orbit 450 - 500 km, so maybe up to 1500 km distance from you if its at the edge of reachability, for a worst case. That’s 5 ms, or 10 ms from you to the server. At those low distances the buffering overhead of their system will dominate like with Wifi. I don’t know how it works for Starlink specifically.

    I think the real killer issue for starlink and realtime tasks is the constantly changing latency, and the handoff between satellites.




  • Yea there is a lot of bad translations out there including movie subtitles. Here in Switzerland they usually have double subtitles in the cinema if you want to watch the original dub. So you can be annoyed at both the French and German translations at the same time.

    Games and Websites tend to be worse though. Yesterday I followed a link to a Heise article, and linked was the English version. It was genuinley hard to grasph in some paragraphs. Switching to German made it much clearer. Not because I understand German better, my grasp of English is good. It was because the English writing was just bad, and didn’t convey the original intent of the German version.

    Most often it’s not that the translations are wrong in content, but just contain very unnatural use of the target language.