1730768 - High CPU usage on https://portlandsto.ca/interactive-project-map/

Status: RESOLVED DUPLICATE of bug 1010527

(Core :: Graphics: WebRender, defect)

Description

[Botond Ballo [:botond]]

Basic information

Steps to Reproduce

1. Load https://portlandsto.ca/interactive-project-map/
2. Leave the page open without interacting with it

Expected Results

Given that I'm not interacting with the page, and nothing on the page is moving, I would expect CPU usage to be relatively low.

Actual Results

CPU usage is high (~70% of a core, fan spinning at high speed).

In Chrome, CPU usage on this page is lower but nonzero (~30% of a core, fan spinning at a lower speed).

---

More information

Profile URL: https://share.firefox.dev/2VFOzEy

Basic systems configuration:

OS version: Debian 10

GPU model: Intel HD Graphics 5500

Number of cores: 2 (4 threads)

Amount of memory (RAM): 8 GB

Comment 1

[Markus Stange [:mstange]]

It looks like there is a WebGL animation, and the slow part is reading back the canvas in the content process and copying it into a shmem. Don't we have a fast path for compositing WebGL on Linux? What's preventing us from using it on this machine / in this configuration?

Comment 2

[Darkspirit]

Please attach about:support.
Gbm/Dmabuf WebGL is available on EGL:

• Wayland (MOZ_ENABLE_WAYLAND=1) with Mesa or with proprietary Nvidia driver >= 495.
• X11 & Xwayland with Mesa >= 21 (bug 1695933, should be lowered)

Comment 3

[Markus Stange [:mstange]]

needinfo for comment 2

Comment 4

[Darkspirit]

(In reply to Botond Ballo [:botond] from comment #0)

OS version: Debian 10

That's Debian oldstable: https://packages.debian.org/buster/libegl-mesa0

You can enable EGL by setting gfx.x11-egl.force-enabled to true and restarting Nightly.
(widget.dmabuf-webgl.enabled is already true, but has only effect when using EGL.)
Does EGL help?

Comment 5

[Darkspirit]

MOZ_LOG="Dmabuf:5"
EGL/Gbm/Dmabuf WebGL works if your log looks like this:

[Child 4488: Main Thread]: D/Dmabuf nsDMABufDevice::Configure()
[Child 4488: Main Thread]: D/Dmabuf Loading DMABuf system library libgbm.so.1 ...
[Child 4488: Main Thread]: D/Dmabuf DMABuf is enabled, using drm node /dev/dri/renderD128

[Child 4488: Main Thread]: D/Dmabuf Creating without modifiers
[Child 4488: Main Thread]: D/Dmabuf Success
[Child 4488: Main Thread]: D/Dmabuf DMABufSurface::ReleaseDMABuf() UID 130
[Child 4488: Main Thread]: D/Dmabuf DMABufSurfaceRGBA::Serialize() UID 132
[Parent 4108: Compositor]: D/Dmabuf DMABufSurfaceRGBA::ImportSurfaceDescriptor() UID 131 size 1024 x 1024
[Parent 4108: Compositor]: D/Dmabuf DMABufSurfaceRGBA::ImportSurfaceDescriptor() UID 132 size 1024 x 1024
[Parent 4108: Renderer]: D/Dmabuf DMABufSurface::ReleaseDMABuf() UID 130
[Parent 4108: Renderer]: D/Dmabuf DMABufSurface::ReleaseDMABuf() UID 131

Comment 6

[Botond Ballo [:botond]]

(In reply to Darkspirit from comment #4)

You can enable EGL by setting gfx.x11-egl.force-enabled to true and restarting Nightly.
(widget.dmabuf-webgl.enabled is already true, but has only effect when using EGL.)
Does EGL help?

I can confirm that enabling EGL reduces CPU usage on this page to ~40%, which is more comparable to Chrome. Thanks!