Bug 2142779

Description of problem:

In Anaconda installer Web UI we are developing we are using PatternFly / React. Progress animations are causing excessive CPU load when installing in kvm Virtual Machines. We are seeing the issue also on regular system (kvm Virtual Machines with Fedora 37).

Version-Release number of selected component (if applicable):

Fedora 37

How reproducible:

Always

Steps to Reproduce: 
1.
2.
3.

In Fedora 37 in kvm vm (4 CPUs, 4GB RAM) run React application with animations:
(the hypervisor: [1])

1) for example the basic react app from https://create-react-app.dev/:
npx create-react-app my-app

2) or our testing small app with PatternFly Spinner / Skeleton / EmptyStateIcon components:
https://rvykydal.fedorapeople.org/testing_app_spinner.tar.gz

and watch the CPU load.

Tasks: 300 total,   3 running, 297 sleeping,   0 stopped,   0 zombie
%Cpu(s): 62.4 us,  6.6 sy,  0.0 ni, 29.9 id,  0.0 wa,  0.9 hi,  0.1 si,  0.1 st
MiB Mem :   3821.3 total,    469.5 free,   1648.5 used,   1703.3 buff/cache
MiB Swap:   3821.0 total,   3820.7 free,      0.2 used.   1903.8 avail Mem.

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
   6556 rvykydal  20   0  103.1g 198356 138120 R 159.5   5.1   0:51.26 WebKitWebProces
   1593 rvykydal  20   0 4877300 336756 141340 S  96.0   8.6  11:51.67 gnome-shell
   6531 rvykydal  20   0  102.4g 134476 100164 R  18.6   3.4   0:06.34 cockpit-client
   5657 root      20   0       0      0      0 I   0.7   0.0   0:00.39 kworker/u8:3-events_unbound
      1 root      20   0  172100  17948  11228 S   0.0   0.5   0:02.64 systemd

after hiding the animations:

Tasks: 297 total,   1 running, 296 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.1 us,  0.2 sy,  0.0 ni, 99.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.1 st
MiB Mem :   3821.3 total,    455.0 free,   1663.1 used,   1703.2 buff/cache
MiB Swap:   3821.0 total,   3820.7 free,      0.2 used.   1889.3 avail Mem.

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
   6629 rvykydal  20   0  224952   4008   3092 R   0.7   0.1   0:00.07 top
    115 root      20   0       0      0      0 I   0.3   0.0   0:01.26 kworker/u8:6-events_unbound
    706 systemd+  20   0   16156   7880   6948 S   0.3   0.2   0:07.07 systemd-oomd
   1785 root      20   0  239168   9144   7708 S   0.3   0.2   0:06.21 sssd_kcm
      1 root      20   0  172100  17948  11228 S   0.0   0.5   0:02.64 systemd

We use cockpit-client which is using WebKit2Gtk:
/usr/libexec/cockpit-client --external-ws http://127.0.0.1:8000

Actual results:

Excessive CPU load.

Expected results:

No excessive CPU load.

Additional info:

We have been resolving similar issues with Gtk spinner in VM in Anaconda Gtk GUI: https://bugzilla.redhat.com/show_bug.cgi?id=1204242
and also now played with animation paramteres to reduce the CPU load as a workaround:
https://github.com/rhinstaller/anaconda/pull/4424.

Tasks: 300 total,   1 running, 299 sleeping,   0 stopped,   0 zombie
%Cpu(s): 50.5 us,  9.8 sy,  0.0 ni, 38.1 id,  0.0 wa,  1.3 hi,  0.2 si,  0.1 st
MiB Mem :   3821.3 total,    236.8 free,   1873.9 used,   1710.5 buff/cache
MiB Swap:   3821.0 total,   3820.7 free,      0.2 used.   1669.9 avail Mem.

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
   1593 rvykydal  20   0 4893472 361112 150732 S 152.8   9.2  13:17.47 gnome-shell
   6665 rvykydal  20   0 3184384 332144 163372 S  53.5   8.5   0:22.22 firefox
   6764 rvykydal  20   0 2671764 118320  99468 S  31.2   3.0   0:10.05 Isolated Web Co
   5657 root      20   0       0      0      0 I   1.0   0.0   0:00.58 kworker/u8:3-events_unbound
    115 root      20   0       0      0      0 I   0.3   0.0   0:01.47 kworker/u8:6-blkcg_punt_bio
      1 root      20   0  172100  17948  11228 S   0.0   0.5   0:02.65 systemd

We also tried run firefox --kiosk http://127.0.0.1:8000. In this case the CPU load is far better for Firefox, but the load of gnome-shell process (which was already high for webkit) has significantly risen.

after hiding the animations:

Tasks: 306 total,   1 running, 305 sleeping,   0 stopped,   0 zombie
%Cpu(s):  1.1 us,  0.4 sy,  0.0 ni, 98.3 id,  0.0 wa,  0.2 hi,  0.0 si,  0.0 st
MiB Mem :   3821.3 total,    246.9 free,   1863.8 used,   1710.6 buff/cache
MiB Swap:   3821.0 total,   3820.7 free,      0.2 used.   1680.0 avail Mem.

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
   6665 rvykydal  20   0 3174128 333376 164136 S   3.3   8.5   0:34.78 firefox
   6985 rvykydal  20   0  224964   3932   3004 R   1.0   0.1   0:00.07 top
   6764 rvykydal  20   0 2673812 118864  99916 S   0.7   3.0   0:16.98 Isolated Web Co
   1785 root      20   0  239168   9144   7708 S   0.3   0.2   0:06.50 sssd_kcm
   3370 rvykydal  20   0   16260   6904   5092 S   0.3   0.2   0:00.08 sshd
      1 root      20   0  172100  17948  11228 S   0.0   0.5   0:02.65 systemd



--------------------------

[1] the hypervisor:

[rvykydal@cobra04 ~]$ uname -a
Linux cobra04 5.13.10-100.fc33.x86_64 #1 SMP Thu Aug 12 21:15:41 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
[rvykydal@cobra04 ~]$ rpm -qi libvirt
Name        : libvirt
Version     : 6.6.0
Release     : 5.fc33
Architecture: x86_64