Nouveau - Nov 2017 - [Bug 103897] New: Kernel 4.14 causes high cpu usage, 4.12 was OK

https://bugs.freedesktop.org/show_bug.cgi?id=103897

            Bug ID: 103897
           Summary: Kernel 4.14 causes high cpu usage, 4.12 was OK
           Product: xorg
           Version: git
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: randrik at mail.ru
        QA Contact: xorg-team at lists.x.org

Hello. After upgrading my kernel to 4.14 I noticed strange behavior: If I load
X (KDE 3.5.10 session with built-in compositor [kompmgr], self-compiled with
many patches, X server 1.19.5, nouveau DDX git) and start to use seamonkey 2.49
(again, self-compiled with gtk2 toolkit, not default gtk3) - after some hours
of use X started to eat a lot of CPU time, new windows appear after delay,
glxgears slow down to 11 fps or so from default 60. If I restart X session -
everything back to normal, for few hours. If I quit seamonkey - CPU usage
drops. But if I start it up again - CPU load returns quickly, and not go down
until X restart.

Seamonkey use hw compositing (force-enabled) and multiprocess experimental
option. Problem is, exactly same seamonkey with same set of tabs work fine on
4.12.0 kernel!

I set architecture to ia32, even if kernel compiled for x86_64 , because all my
userspace is 32-bit.

hw:
01:00.0 0300: 10de:0606 (rev a2) (prog-if 00 [VGA controller])
aka
01:00.0 VGA compatible controller: NVIDIA Corporation G92 [GeForce 8800 GS]
(rev a2) (prog-if 00 [VGA controller])

X log, dmesg, opreport data will follow.

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--- Comment #1 from Andrew Randrianasulu <randrik at mail.ru> ---
Created attachment 135703
  --> https://bugs.freedesktop.org/attachment.cgi?id=135703&action=edit
X log

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--- Comment #2 from Andrew Randrianasulu <randrik at mail.ru> ---
Created attachment 135704
  --> https://bugs.freedesktop.org/attachment.cgi?id=135704&action=edit
dmesg

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--- Comment #3 from Andrew Randrianasulu <randrik at mail.ru> ---
Created attachment 135705
  --> https://bugs.freedesktop.org/attachment.cgi?id=135705&action=edit
opreport

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--- Comment #4 from Andrew Randrianasulu <randrik at mail.ru> ---
Created attachment 135706
  --> https://bugs.freedesktop.org/attachment.cgi?id=135706&action=edit
kernel's config.gz

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--- Comment #5 from Andrew Randrianasulu <randrik at mail.ru> ---
It seems setting option DRI to "2" instead of "3"
workarounds this problem.

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--- Comment #6 from Andrew Randrianasulu <randrik at mail.ru> ---
Bug still here on 4.14.9-x64.

But it seems if I use "xset dpms force standby" X also doesn't eat
CPU anymore.
If X enters such state by default after some time of user inactivity - it also
don't eat CPU time. Unfortunately, I can't do anything useful wih
seamonkey if
my screen is off.

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--- Comment #7 from Andrew Randrianasulu <randrik at mail.ru> ---
This bug still around for me with 4.15.0

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #8 from Martin Peres <martin.peres at free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance:
https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/385.

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