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X11 vs Wayland cursor latency (mort.coffee)

submitted 2 days ago by Feathercrown to c/linux

6 comments fedilink hide all child comments

I don't think he should have included the starting frame-- if the cursor were theoretically instant, his method records it with a 1 frame delay, and this +1 frame error happens on every test. Correcting this actually makes Wayland more laggy proportionally, although it makes both less laggy absolutely.

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[–] A_A 7 points 2 days ago* (last edited 2 days ago) (1 children)

Latency raw data :

Gnome Variant	Δ camera frames	Average (Δ)	Δ milli seconds	Δ monitor refreshes
X11	5 4 3 4 5 4 6 5 1 4 4 4 3 4 4 4	4.00	16.7	2.4
Wayland	6 5 6 5 5 6 6 4 8 6 5 5 5 6 5 6	5.5625	23.2	3.3
Δ(Δ)	- -	~1.5	~6.5	~1.0

instead of calculating the average one could decide to drop the data points that are way outside of their goups.
Doing so, in the first group I would neglect the value of Δ = 1 or 6 frame and in the second group I would neglect the value of 4 or 8 frames

Results :
X11 : from 3 to 5 frames
Wayland : from 5 to 6 frames
Δ(Δ) = 5.5 - 4 = 1.5

Still it doesn't change the final result that the difference between these two Gnome versions is 1.5 camera frames at 240 frames per second.

[–] Feathercrown 3 points 2 days ago (1 children)

Good analysis

[–] A_A 2 points 2 days ago* (last edited 2 days ago)

Thanks. Also, after a bit of thought, i do believe you are right saying that we should remove one frame of all the raw camera data. ... it will, as you say, decrease the absolute values and make Wayland more laggy proportionally, yet, it doesn't change the absolute difference.