3 ms·

> using (undocumented!) channel scrambling offsets that works on AMD, Intel, and Graviton Seems odd to me that all three architectures implement this yet all t

> using (undocumented!) channel scrambling offsets that works on AMD, Intel, and Graviton Seems odd to me that all three architectures implement this yet all three leave it undocumented. Is it intended as some sort of debug functionality or what?

alex_duf 7mo ago
it's explained in the video, and there's no way I'll be explaining it better than her
- em-bee 7mo ago
  you could however link to the timestamp where that particular explanation starts. i am afraid i don't have time to watch a one hour video just to satisfy my curiosity.
  - vitus 7mo ago
    This is approximately the section in the video titled "Memory controllers hate you" (https://www.youtube.com/watch?v=KKbgulTp3FE&t=1399s https://www.youtube.com/watch?v=KKbgulTp3FE&t=1399s), combined with the following section. The actual explanation starts a couple minutes later, around https://youtu.be/KKbgulTp3FE?t=1553 https://youtu.be/KKbgulTp3FE?t=1553. The short explanation is performance (essentially load balancing against multiple RAM banks for large sequential RAM accesses), combined with a security-via-obscurity layer of defense against rowhammer.
  - _flux 7mo ago
    I've found Gemini useful in extracting timestamps for particular spots in videos. Presumably it works with transcriptions, given how fast it is. The three answers it found were: - Avoiding lock-in to them: http://www.youtube.com/watch?v=KKbgulTp3FE&t=1914 http://www.youtube.com/watch?v=KKbgulTp3FE&t=1914 - Competitive advantage: http://www.youtube.com/watch?v=KKbgulTp3FE&t=1852 http://www.youtube.com/watch?v=KKbgulTp3FE&t=1852 - Perceived Lack of Use Case: http://www.youtube.com/watch?v=KKbgulTp3FE&t=1971 http://www.youtube.com/watch?v=KKbgulTp3FE&t=1971 Those points do actually exist in the video, I checked. If there are more, I don't know about them, as I haven't yet watched the rest of the video.

alex_duf 7mo ago

it's explained in the video, and there's no way I'll be explaining it better than her

em-bee 7mo ago
you could however link to the timestamp where that particular explanation starts. i am afraid i don't have time to watch a one hour video just to satisfy my curiosity.
- vitus 7mo ago
  This is approximately the section in the video titled "Memory controllers hate you" (https://www.youtube.com/watch?v=KKbgulTp3FE&t=1399s https://www.youtube.com/watch?v=KKbgulTp3FE&t=1399s), combined with the following section. The actual explanation starts a couple minutes later, around https://youtu.be/KKbgulTp3FE?t=1553 https://youtu.be/KKbgulTp3FE?t=1553. The short explanation is performance (essentially load balancing against multiple RAM banks for large sequential RAM accesses), combined with a security-via-obscurity layer of defense against rowhammer.
- _flux 7mo ago
  I've found Gemini useful in extracting timestamps for particular spots in videos. Presumably it works with transcriptions, given how fast it is. The three answers it found were: - Avoiding lock-in to them: http://www.youtube.com/watch?v=KKbgulTp3FE&t=1914 http://www.youtube.com/watch?v=KKbgulTp3FE&t=1914 - Competitive advantage: http://www.youtube.com/watch?v=KKbgulTp3FE&t=1852 http://www.youtube.com/watch?v=KKbgulTp3FE&t=1852 - Perceived Lack of Use Case: http://www.youtube.com/watch?v=KKbgulTp3FE&t=1971 http://www.youtube.com/watch?v=KKbgulTp3FE&t=1971 Those points do actually exist in the video, I checked. If there are more, I don't know about them, as I haven't yet watched the rest of the video.