John Carmack Tech Talk with UMKC-SCE
Why Hacker News recommends it
Recommended whenever latency, buffering or VR comfort comes up, as an accessible account from someone who dealt with it directly.
What it is
John Carmack speaks at UMKC's 2017 commencement event about the difficulties of VR, especially end-to-end latency across hardware and software. He covers why latency and buffering matter and how nausea is addressed.
Recommended by 3 HN commenters across 3 different months, 2017 to 2023.
What Hacker News said
Strong rec chubot · 2017-07 · on “Terminal and shell performance”
If you care about end-to-end latency, I highly recommend this talk by John Carmack: [this video] This talk blew my mind and made me feel like a terrible engineer. He's talking about end-to-end latency in VR, which actually has a commercial motivation because VR products with high latency will make you sick. (this obviously doesn't happen with shells and terminals!) He's talking about the buffering and filtering at every step of the way. And it's not just software -- sensors have their own controllers to do filtering, which requires buffering, before your OS kernel can even SEE the the first byte, let alone user space. On the other side, display devices and audio output devices also do nontrivial
Recommends chubot · 2017-07 · on “Terminal and shell performance”
Oh definitely, see my comment here about an excellent talk by John Carmack on this very subject (end-to-end hardware/software latency in VR): [this video] [LINK]
Recommends waivek · 2017-08 · on “John Carmack on Functional Programming (2013) [video]”
[this video] I disagree. See the above link for a lecture where he describes the difficulties in VR in a manner that anybody with minimal programming experience can understand.
Recommends Dig1t · 2023-05 · on “Apple's Reality Pro headset compromised”
>Also, prolonged use causes nausea in a large percentage of people. There's an excellent video of John Carmack talking about this and how to solve it. This is much less of an issue now. [this video] I agree with you though that there aren't any killer apps for VR/AR yet, and it remains to be seen if there will be any at all.
Cites hoten · 2023-06 · on “How does Linux handle writes?”
John Carmack's lecture on systems engineering / reducing latency for VR mentions buffers repeatedly: [this video]