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When VSYNC disabled on Nvida, high CPU usage #76

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StarrKiss opened this issue May 5, 2020 · 3 comments
Open

When VSYNC disabled on Nvida, high CPU usage #76

StarrKiss opened this issue May 5, 2020 · 3 comments
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@StarrKiss
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Hello, I don't honestly notice vsync or that sort of tearing that much, I use this for stutter reduction and animation curves. As such, my compositor settings are set up like this:
image
Recently, WITHOUT UPDATING, Kwin has now been taking up upwards of 8 percent of my CPU, and I have a relatively beefy CPU. How do I fix this problem?

@tildearrow tildearrow self-assigned this May 5, 2020
@tildearrow
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tildearrow commented May 5, 2020

Can you please paste the output of

top -p `pgrep kwin_x11`

after 5 seconds? I want to see if KWin is eating one CPU core.

(P. S. it is not recommended to disable VSync)

@StarrKiss
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Here:
https://pastebin.com/9D8W7Jb6
Why is it not recomended to disable Vsync? Wouldn't that reduce load on CPU? (also, if not, what should I send the VSYNC mechanism to, as I am using a newer Nvidia driver?)

@tildearrow
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Disabling VSync:

  • introduces tearing
  • may increase CPU (and GPU) usage since there is no FPS limit
  • defeats the main point of this project

Are you having problems with VSync on?
I am not sure what VSync mechanism to use, but try tinkering a bit, and tell me which one works best.

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