1344162 - [Ubuntu] Low FPS and delaying in performing actions on web gl game

Status: NEW

(Core :: Graphics: CanvasWebGL, defect, P3)

Description

[Petruta Horea [:phorea], Desktop QA]

[Affected versions]:
- Firefox 51.0.1
- Firefox 52RC
- latest Aurora 53.0a2
- latest Nightly 54.0a1

[Affected platforms]:
- Linux 16.04 x64 LTS

[Steps to reproduce]:
1. Open http://chandlerprall.github.io/Physijs/examples/jenga.html
2. Click and drag the blocks
3. Observe FPS on top left corner

[Expected result]:
- Both FPS displayed are high (and have approximately the same rate) and the blocks can be easily moved around

[Actual result]:
- Bottom FPS rate is very low (~0-10) and there is a delay when moving blocks (or the blocks are not moving at all)

[Regression range]:
- https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=f5cd6f6bc89e310091674f09f19e18f92a949aa6&tochange=484087507430a3008fdc0d54685e3c3d4b82f948

Although from this range I suspect bug 1288746, mozregression tool points to bug 1300658.

[Note]:
- Frame rate is low on all versions, although there are some spikes (111-112) on RC to Nightly who aren't improving performance

Comment 1

[Petruta Horea [:phorea], Desktop QA]

Adding suspected culprits to See Also section until we know for sure.

Comment 2

[Ben Kelly [:bkelly, not reviewing]]

So, bug 1300658 works the same across all platforms.  On windows 10 I get 60fps on this site in 54.0a1 (2017-03-01) (64-bit).  Bug 1300658 will delay some runnables from worker threads if the main thread is busy.  This suggests to me that the main thread on your linux machine is saturated for some reason.  Is it getting webgl hardware acceleration?

Comment 3

[Petruta Horea [:phorea], Desktop QA]

I've hit this without modifying the default profile on two Linux machines. Here's the about:support Graphics section:
Graphics
Features
Compositing	Basic
Asynchronous Pan/Zoom	wheel input enabled; touch input enabled
WebGL Renderer	Intel Open Source Technology Center -- Mesa DRI Intel(R) Ivybridge Desktop
WebGL2 Renderer	Intel Open Source Technology Center -- Mesa DRI Intel(R) Ivybridge Desktop
Hardware H264 Decoding	No
Audio Backend	pulse
GPU #1
Active	Yes
Description	Intel Open Source Technology Center -- Mesa DRI Intel(R) Ivybridge Desktop
Vendor ID	Intel Open Source Technology Center
Device ID	Mesa DRI Intel(R) Ivybridge Desktop
Driver Version	3.0 Mesa 11.2.0
Diagnostics
AzureCanvasAccelerated	0
AzureCanvasBackend	skia
AzureContentBackend	skia
AzureFallbackCanvasBackend	none
CairoUseXRender	0
Decision Log
HW_COMPOSITING	blocked by default: Acceleration blocked by platform
OPENGL_COMPOSITING	unavailable by default: Hardware compositing is disabled

If I set webgl.force-enabled, webgl.msaa-force and layers.acceleration.force-enabled to true the result is about the same.

Comment 4

[Liz Henry (:lizzard) (relman/hg->git project)]

Too late for a fix for 53. If this isn't something we care about in time for 54 it may just go into general backlog.