1525246 - [WebRender Android] - gfx.webrender.debug.gpu-time-queries does nothing

Status: RESOLVED WONTFIX

(Core :: Graphics: WebRender, defect, P5)

Description

[Mark]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:67.0) Gecko/20100101 Firefox/67.0

Steps to reproduce:

BQ Aquaris X5, Adreno 306, Android 7.1.2
Reference-browser

Turn on WebRender, turn on compact profiler, turn on debug profiler

Debug profiler gives some reasonable figures for eg Compositor times

Turn on gfx.webrender.debug.gpu-time-queries

GPU times remain at zero ms whatever I do

Same result on Galaxy S7

GPU times should show real numbers like on desktop.

Comment 1

[Kris Taeleman (:ktaeleman)]

This works on Pixel 3, so might be Adreno 3xx and Mali GPU class related.

Comment 2

[Mark]

Attachment: Screenshot_20200214-122149_Firefox Nightly.jpg

Comment 3

[Mark]

On my new Galaxy A40 gfx.webrender.debug.gpu-time-queries TRUE shows the colored moving horizontal histogram, but the web page is corrupted and stutters/strobes like crazy when I try to scroll. Basically unusable. See the screenshot attached above.

Comment 4

[Mark]

The strobing I reported in Comment 2 and comment 3 is possibly a dup of bug 1558374 (Galaxy A40 = ARM Mali GPU)

Comment 5

[Glenn Watson [:gw]]

The GPU time queries APIs are in general problematic on tile-based GPUs. We may need a different profiling solution for them.