[Video] Why is this PCIe Card RADIOACTIVE?


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44 Comments

  1. This is highly impressive the applications are limitless i would go as far as loosely calling this "revolutionary" also the fact that its open source is excellent now things are getting interesting once again in the pc universe. I have a strong feeling this product could have strong applications for astrophysics its very exciting.

  2. Ok. So, the time is accurate across the group.

    What about latency from OS? Network? Disk? Do we have bounded latency and can rely on it so that we can rely on timestamp instead of consensus protocol? Or do we fix things by anti-entropy?

  3. LTT I'm having a problem that I think you guys should make a fix for on tech quicky. It's with screen tearing. It makes my OBS recordings look pretty bad. I've looked at all the tutorials online on how to fix screen tearing but nothing seems to be working.

  4. what? computers can absolutely handle packets with future timestamps. there is no reason anyone should be adding a 20ms processing delay just to makes sure the timestamp is in the past. even IF a computer could only handle past timestamps, this would be easily solved by just editing them to appear in the past. this can be done by the sending or receiving computer with virtually no overhead

  5. hi linus i got problem with my gpu gt630 i cant instal new grapics driver i got 2018 driver also randomly my screen turns off but pc still works so what problem is it can you help me pls pls pls

  6. I don't buy the supposed benefits for gamers. It's great if you can have precise timestamps from every participant in a network, but that is completely useless if you cannot trust every participant in the network to truthfully report them. If precise timestamps where to be used for detecting who shot first as in the example Linus mentioned, what stops a player from always reporting the earliest timestamps possible in order to have a higher chance of being the winner in an encounter?

    Also the claimed use case for security purposes is probably very niche, since regular IP communication usually doesn't have constant and predictable latencies anyways, since there are delays from buffering and from packets taking different routes, that can change the latency at any time, without anyone trying to tamper with the connection.

  7. I would definitely buy one to try some different projects if they were cheaper. Games that have large asset counts and lots of physics going on for multiplayer seems like something that could really benefit from something like this.

  8. Hey we use these Symmetricon atomic clocks to track whales!

    The key ability of these clock sources is that they have a very low drift once stabilised to an external reference source (ie GPS). You can then remove the GPS, stick the thing underwater for several months, and know that your data timestamps are accurate to within several milliseconds (good enough to find aquatic callers).

    PTP (Precision Time Protocol) is an independent thing, which doesn't necessarily rely on an atomic clock as its timing reference (we use GPS referenced PTP grand masters at work)… Although technically the GPS satellites use atomic clocks as their references… so it is sort of true…

    What you DO need for PTP that Linus touched on is a a network card that supports hardware timestamping, where the card knows its own physical time delays to the nanosecond for acquiring packets. If you want to access a PTP server over a switch and maintain best accuracy, then you also need a 'transparent switch' where the switch actually detects the PTP timing packets and UPDATES their contents (timestamps) based on its own knowledge of how long it handled (delayed) the packet! Crazy stuff, but super handy when building an army of robots to assemble a car to make sure they work together correctly.

    Thanks for listening to my Ted Talk.

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