Closed Bug 1643695 Opened 5 years ago Closed 4 years ago

very high CPU usage on Google Meet with webrender enabled (macOS)

Categories

(Core :: Graphics: WebRender, defect)

Product:
Core
Component:
Graphics: WebRender
Platform:
x86_64
macOS
Type:
defect

Tracking

()

Status:
RESOLVED FIXED

People

(Reporter: jovan.gerodetti, Unassigned)

References

Details

When joining a Google Meet call with 78.0b3 on macOS and webrender enabled, Firefox will start to cause very high CPU usage. The CPU usage grows even more when there are more than 2 people on the call.
This means:

  • Main Process: 150 - 200%
  • Content Process: 200%
  • kernel_task (not always): 200 - 300%

Device Specs:

  • MacBook Pro (15-inch, 2018)
  • Processor 2,2 GHz 6-Core Intel Core i7
  • Memory 16 GB 2400 MHz DDR4
  • Graphics Radeon Pro 555X 4 GB / Intel UHD Graphics 630 1536 MB
  • macOS 10.15.5 (19F101)

Performance Profile: https://share.firefox.dev/3dC9sUW

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Component: General → Graphics: WebRender
Product: Firefox → Core
Blocks: wr-mac
No longer blocks: wr-mac
Severity: -- → S3

The attached profile just shows us waiting for the gpu/kernel.

Jovan, did you have gfx.webrender.compostitor set to true or false when you experienced this?

Flags: needinfo?(jovan.gerodetti)

I had gfx.webredner.all set to true, does that imply gfx.webrender.compostitor? I didn't set gfx.webrender.compostitor independently. I'm now on 78.0b5 and the performance got somewhat better. It's still higher than without web render, but I still can use my machine during calls.

Flags: needinfo?(jovan.gerodetti)

I think this might be caused by machine running out of VRAM. I always have an external montior connected and just the monitor already pushes the VRAM usage to 60%. Launching Firefox with webrender enabled fills the VRAM to 80% to 99%.

How are you measuring VRAM usage?

Flags: needinfo?(jovan.gerodetti)

Also can you try with today's Nightly to see if things have improved?

I "measured" that with "iStat Menus". I will try Nightly and report back.

Flags: needinfo?(jovan.gerodetti)

@Jovan: Can you check if you are still seeing this on Nightly?

Flags: needinfo?(jovan.gerodetti)

Performance is much better now on nightly.

Flags: needinfo?(jovan.gerodetti)

Thanks @Jovan! Let us know if you see further issues.

Status: UNCONFIRMED → RESOLVED
Closed: 4 years ago
Resolution: --- → FIXED
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