FF91 and newer produce *huge* CPU-Load in certain situations
Categories
(Firefox :: Untriaged, defect)
Tracking
()
People
(Reporter: iYx3Zp8Q08hrNVZCHTYt, Unassigned, NeedInfo)
Details
Attachments
(4 files)
machine1_problem_on_95.0.1.png
Steps to reproduce:
Systems: Debian 11, Mint 19.3, Windows7/Server2k8R2
FF-Versions: FF91 and newer
After updating from FF78LTS (where the bug did not appear that noticable) to FF91LTS unknown circumstances frequently appear leading to FF producing huge CPU load, although the websites have no visible animation or any other tasks to do. Reloading the website temporary fixes the bug - but only until the unknown circumstances reappear some minutes later.
This happens with different websites - all being long-time-interacted rich internet applications. So a bug in a website itself can be ruled out.
Steps to reproduce:
- login to https://demo.sogo.nu/SOGo/ using username "sogo1" and pw "sogo1"
- make sure, the list of emails displayed in "inbox" is longer than the box is - so a scrollbar is displayed (if not, create some emails by copying them to/from "drafts" and back to "inbox")
- select first mail in inbox
- press the down key
- see the cpu going crazy
On computers with weak/old CPUs the impact was more noticable than on such with modern CPUs.
Accessing the erroneous firefox instance by a RDP connection also shows a huge traffic being transferred although there is no motion/animation. So unnecessary redraws of the whole FF window must be the case.
As far as I can tell from the debug console the problem seems to be related to high frequently calls of "requestAnimationFrame". Setting "gfx.webrender.force-disabled" to "true" seems to lower the CPU consumption.
I was able to reproduce the problem on different machines, settings and also with newer Versions of FF (tested up to FF95.0.1):
Test 1 - problem confirmed:
johndoe@machine1:~$ dpkg -l | grep firefox
ii firefox 95.0.1+linuxmint1.1+tricia amd64 Safe
and easy web browser from Mozilla
ii firefox-locale-de 95.0.1+linuxmint1.1+tricia amd64 German
language pack for Firefox
johndoe@machine1:$ uname -a18.04.1-Ubuntu SMP Thu Nov 11
Linux machine 5.4.0-91-generic #102
14:46:36 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
johndoe@machine1:~$ lsb_release -a
No LSB modules are available.
Distributor ID: LinuxMint
Description: Linux Mint 19.3 Tricia
Release: 19.3
Codename: tricia
johndoe@machine1:~$ lscpu
CPU(s): 2
Modellname: Intel(R) Core(TM)2 CPU 6600 @
2.40GHz
Stepping: 6
CPU MHz: 2082.280
Maximale Taktfrequenz der CPU: 2394,0000
Minimale Taktfrequenz der CPU: 1596,0000
BogoMIPS: 4799.65
Test 2 - problem slightly visible in ff78esr, but not as extreme as in ff95esr:
johndoe@machine2:$ dpkg -l | grep firefoxdeb10u1 amd64
ii firefox-esr 78.15.0esr-1
Mozilla Firefox web browser - Extended Support Release (ESR)
ii firefox-esr-l10n-de 78.15.0esr-1~deb10u1 all
German language package for Firefox ESR
johndoe@machine2:~$ uname -a
Linux machine 4.19.0-18-amd64 #1 SMP Debian 4.19.208-1 (2021-09-29)
x86_64 GNU/Linux
johndoe@machine2:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 10 (buster)
Release: 10
Codename: buster
johndoe@machine2:~$ lscpu
CPU(s): 2
Modellname: Intel(R) Pentium(R) CPU P6100 @
2.00GHz
Stepping: 5
CPU MHz: 931.269
Maximale Taktfrequenz der CPU: 1999,0000
Minimale Taktfrequenz der CPU: 933,0000
BogoMIPS: 3990.36
Test 3 - problem confirmed:
johndoe@machine3:~$ dpkg -l | grep firefox
ii firefox 95.0.1+linuxmint1.1+tricia amd64
Safe and easy web browser from Mozilla
ii firefox-locale-de 95.0.1+linuxmint1.1+tricia
amd64 German language pack for Firefox
johndoe@machine3:~$ uname -a
Linux machine 5.6.6-050606-generic #202004210831 SMP Tue Apr 21 08:33:23
UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
johndoe@machine3:~$ lsb_release -a
No LSB modules are available.
Distributor ID: LinuxMint
Description: Linux Mint 19.3 Tricia
Release: 19.3
Codename: tricia
johndoe@machine3:~$ lscpu
CPU(s): 12
Modellname: AMD Ryzen 5 3600 6-Core Processor
Stepping: 0
CPU MHz: 2198.910
Maximale Taktfrequenz der CPU: 3600,0000
Minimale Taktfrequenz der CPU: 2200,0000
BogoMIPS: 7199.25
Actual results:
Firefox produces unexpectedly huge and permanent CPU-Load where no siginificant load is expected.
Expected results:
FF should only consume minimal ressources.
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Reporter | |
Comment 1•3 years ago
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Reporter | |
Comment 2•3 years ago
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Comment 3•3 years ago
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Hey iYx3Zp8Q08hrNVZCHTYt,
Can you test the issue while in Safe Mode? You can find helpful info here : https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode .
Testing with a fresh new profile could help. You can find more about creating a new profile here : https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems#w_6-create-a-new-firefox-profile .
If possible, you can test this issue on the nightly build as well. Download the build from : https://www.mozilla.org/en-US/firefox/nightly/all/ .
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Comment 4•3 years ago
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Marking this as Resolved > Incomplete due to reporter's lack of response.
If the issue reoccurs or still persists feel free to re-open or file a new bug.
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Reporter | |
Comment 5•3 years ago
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Hi Andrei,
sorry for the delay. I retested on two different systems with --safe-mode parameter and the bug was still reproducible.
System 1:
FF: latest version 98.0.1
OS: Linux Mint 19.3:
status: problem confirmed
observations:
- opening the Web-Developer-Console (Ctrl+Shift+E) in the tab where the CPU is going crazy seems to calm CPU back down to normal
- switching over to another tab also seems to calm CPU back down to normal; switching back to the erroneous tab restarts the huge load
- performance analysis shows lots of (useless?) rendering activity
System 2:
FF: latest 91.7.0.esr
OS: Debian 11 (bullseye):
status: problem confirmed
observations:
- unusually high rate of calling requestAnimationFrame documented
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Reporter | |
Comment 6•3 years ago
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Reporter | |
Comment 7•3 years ago
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@Andrei Purice:
Please ReOpen the Bug; I have no sufficient rights to do so
Description
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