Re:Desktop compositing latency is real
by Jasper_ on Tuesday November 21, 2017 @11:10AM
(#15748816)
Right, the issue is that 60Hz is ridiculously slow. Ethernet hardware is multiple orders of magnitude faster. It's just because of broadcast TV and CRT legacy. G-Sync / FreeSync allow up to 240Hz, which is ~4ms latency.
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Re:Desktop compositing latency is real
by thomasahle on Tuesday November 21, 2017 @11:37AM
(#15749101)
60Hz is 16.7ms between each picture. However, that only gives you a lower bound on the latency. The actual time from GPU sending picture, to picture being on screen, can be a lot more. See the John Carmack answer above.
Re:Desktop compositing latency is real
by CyberDildonics on Tuesday November 21, 2017 @12:28PM
(#15749611)
No, the issue was that he was using a display with a crazy amount of buffering because they were doing so much filtering and doing it poorly.
Re:Desktop compositing latency is real
by Retric on Wednesday November 22, 2017 @11:33AM
(#15758097)
It's not just monitors even keyboards can have 40+ms worth of delay and it all adds up.
Re:Desktop compositing latency is real
by CyberDildonics on Thursday November 23, 2017 @01:33PM
(#15766950)
I don't think that was what he was referring to
"I video record showing both the game controller and the screen with a 240 fps camera" https://superuser.com/q/419070/2269
So, it's total response times from key press on a game controller to screen that is important not individual components. Sure, 0.04 seconds on it's own is not a big deal, but when 5 or six things take 0.04 seconds you hit noticeable delays.