1410557 - Very slow scrolling on cpu.userbenchmark.com comparison page

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, defect, P1)

Description

[Asif Youssuff]

Steps to reproduce:

turn on gfx.webrender.enabled
turn on gfx.webrendest.enabled
turn on gfx.webrender.layers-free
turn on gfx.webrender.blob-images
turn on layers.acceleration.force-enabled

1. Navigate to http://cpu.userbenchmark.com/Compare/Intel-Pentium-G4600-vs-Intel-Core-i5-2500K/3894vs619
2. Scroll down page


Actual results:

Very slow scrolling. 


Expected results:

Scrolling down page should be as fast or faster than with WebRender off.

Comment 1

[Darkspirit]

Nightly 58 x64 20171020100426 de_DE @ Debian Testing (KDE, Radeon RX480).
main profile:  layers force accel + webrender + webrendest + blob-image + gpu process + omtp + uBlock & basic TP
fresh profile: layers force accel + webrender + webrendest + blob-image

I can't reproduce in both profiles. Pos1/End, scrolling by mousewheel (and autoscrolling in my main profile) are fast as without WebRender.

Comment 2

[Asif Youssuff]

Attachment: about-support-webrender.txt

Perhaps it is driver or hardware related? My GPU is not as good as yours. Attached about:support details.

Comment 4

[Asif Youssuff]

:darkspirit not sure how this is a duplicate -- do you know that these are the same root cause?

Comment 5

[Darkspirit]

Apologies. I learned to mark such (comment 2) extreme similar looking bugs as duplicate to concentrate them and to re-check when the target bug got fixed to either verify or reopen them. At least we have connected them in some way now.

Comment 6

[Asif Youssuff]

Wouldn't say page performance is *great* on my machine, but not to the level as to when I initially reported it.

11:20.32 INFO: Narrowed inbound regression window from [fba516dc, 1613834d] (3 builds) to [fba516dc, 2fc7e206] (2 builds) (~1 steps left)
11:20.32 INFO: No more inbound revisions, bisection finished.
11:20.32 INFO: First good revision: 2fc7e2060d1f66cd9600f6c890578b3a1641738d
11:20.32 INFO: Last bad revision: fba516dc5620ea600c8cfb09ab018458a57c7bb2
11:20.32 INFO: Pushlog:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=fba516dc5620ea600c8cfb09ab018458a57c7bb2&tochange=2fc7e2060d1f66cd9600f6c890578b3a1641738d