Hello,
I got the Nvidia binary 304.32 on KDE 4.9.00 on Fedora 17. KDE desktop effects run pretty flawless at 100+ FPS no matter what I do **but** the second I enable vsync on in desktop effect settings, FPS can drop to a choppy 30FPS. Why does this happen?
Not a solid 30 FPS but a choppy 30 FPS.
With vsync off, no matter what I do the FPS is at or above 100 FPS **but** if I just enable vsync, performance drops to a near 30 during some effects and it's very noticeable. I somewhat can't believe it :(
Why could this be happening?
Victor B. Gonzalez wrote:
I got the Nvidia binary 304.32 on KDE 4.9.00 on Fedora 17. KDE desktop effects run pretty flawless at 100+ FPS no matter what I do **but** the second I enable vsync on in desktop effect settings, FPS can drop to a choppy 30FPS. Why does this happen?
Not a solid 30 FPS but a choppy 30 FPS.
Limiting the framerate to ~30 FPS (i.e. what your screen can actually display) is exactly what vsync is for. Now why it's choppy, I don't know. It might be that the effects are not syncing with vsync, so the FPS varies depending on when vsync hits compared to what the rendering thread is doing, or it might just simply be a driver bug (proprietary drivers are always very buggy, try Nouveau!). (It could be a combination, like the driver failing to tell clients such as KWin that vsync is in use, which would of course be a driver bug.)
Kevin Kofler
My monitor supports 60 FPS. The Nvidia binary is pretty flawless if I disable vsync (albiet the tearing) but enabling vsync in effects makes everything look terrible, choppy and effects go down the drain.
It's really a simple switch. Vsync off and everything is near perfect. Vsync on and everything goes to hell somewhat. Could this really be a driver bug and am I the only one experiencing it?
On Tuesday, August 14, 2012 02:35:09 AM Kevin Kofler wrote:
Victor B. Gonzalez wrote:
I got the Nvidia binary 304.32 on KDE 4.9.00 on Fedora 17. KDE desktop effects run pretty flawless at 100+ FPS no matter what I do **but** the second I enable vsync on in desktop effect settings, FPS can drop to a choppy 30FPS. Why does this happen?
Not a solid 30 FPS but a choppy 30 FPS.
Limiting the framerate to ~30 FPS (i.e. what your screen can actually display) is exactly what vsync is for. Now why it's choppy, I don't know. It might be that the effects are not syncing with vsync, so the FPS varies depending on when vsync hits compared to what the rendering thread is doing, or it might just simply be a driver bug (proprietary drivers are always very buggy, try Nouveau!). (It could be a combination, like the driver failing to tell clients such as KWin that vsync is in use, which would of course be a driver bug.)
Kevin Kofler
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Victor B. Gonzalez