Open Bug 1646859 Opened 4 years ago Updated 2 years ago

High CPU usage using WebRender on Mac and WebRTC

Categories

(Core :: Graphics: WebRender, defect)

Unspecified
macOS
defect

Tracking

()

People

(Reporter: jbonisteel, Unassigned)

References

(Blocks 1 open bug)

Details

Attachments

(1 file)

Drno sees this in a call using whereby.com.

Here are some profiles:

WR on: https://share.firefox.dev/3fhPUWt

WR off: https://share.firefox.dev/2UsEF5m

NI-ing Jeff to take a peak at the profiles

Blocks: wr-mac
Flags: needinfo?(jmuizelaar)

Yeah, so there's something really bad going on in the Renderer thread. It looks like we're spending a lot of time waiting for the GPU.

Nils, how easy it for you to reproduce this? Do you have multiple GPUs in the mac where you see this?

Flags: needinfo?(jmuizelaar) → needinfo?(drno)

This is trivial to repro for me: I only have to do a WebRTC based 1:1 call on whereby.com while using my external monitor.

And yes my 2018 MBP has:

  • Intel UHD Graphics 630
  • Radeon Pro 560X
Flags: needinfo?(drno)
Attached file about_support.txt (deleted) —

Attaching about:support

I think this might need bug 1600178 to be fixed. Can you reproduce the problem when not using the external monitor?

Flags: needinfo?(drno)

Might also be noteworthy that my external monitor is 4K HDR10 and since I'm running 10.15.5 the monitor is running in HDR mode.

Severity: -- → S3

Can you retest this with today's Nightly? 20200708094217 or newer?

@Nils: can you check if this is still happening?

(In reply to Nils Ohlmeier [:drno] from comment #6)

@Nils: can you check if this is still happening?

No longer blocks: wr-mac-nightly
OS: Unspecified → macOS

Declaring NI bankruptcy.

Flags: needinfo?(drno)
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