[Bug 99418] DRI3 Stuttering while scrolling in Chromium/Chrome with VBLANK off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #14 from lei.pero at gmail.com ---
(In reply to Michel Dänzer from comment #13)
> (In reply to lei.pero from comment #7)
> > Sure, i will, it's like performace loss, I'm not sure if video would do the
> > justice,
> 
> Indeed, I'm afraid I can't see much difference, though the DRI2 videos do
> seem slightly smoother.
> 
> Can you create another comparison video with the environment variable
> GALLIUM_HUD=.dfps,requested-VRAM+VRAM-usage,requested-GTT+GTT-usage,
> cpu+temperature+GPU-load,.dnum-bytes-moved,.dbuffer-wait-time,.dnum-
> compilations+num-shaders-created set when starting chromium? It should
> overlay some graphs showing the framerate and other performance related
> values.
> 
> 
> > I think this is hardware specific onr adeon driver (only?).
> 
> Does it not happen using the modesetting driver instead of radeon?

Sure, I did it, will upload now. It does happen on modesetting driver
regardless of DRI version, strange. It's most visible on Chrome/ium scrolling,
but I can also notice it in standard GNOME-shell animations (for example, after
logging in startup animation is not smooth as it should be/as it is on radeon
DRI2), hope this information helps a bit. I'm very positive i can notice same
behaviour in games also (I'm not a gamer, so just a few I play).

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