[Bug 96790] frame stuttering in ut2004

[Bug 96790] frame stuttering in ut2004

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https://bugs.freedesktop.org/show_bug.cgi?id=96790

            Bug ID: 96790
           Summary: frame stuttering in ut2004
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: network723@rkmail.ru
        QA Contact: dri-devel@lists.freedesktop.org

My hardware: HD7950 & Phenom II x6 1090
The problem: intensive frame stuttering and frame rate drops below 30 fps while
playing UT2004. Drops usually happen when there is intensive shooting, but it
may also happen on maps with complex geometry.

Also, in-game fps counter shows 'avg fps' about 90-200, with rare jumps to
300-400 fps, even with vblank_mode=0 set. 64 bit version of the game on Windows
shows stable 300+ fps with OpenGL renderer.

I wonder if this may be related to AMD CPU, since various test results on
Phoronix show much greater performance (up to 5 times) with Intel CPU and same
GPU.

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[Bug 96790] frame stuttering in ut2004

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https://bugs.freedesktop.org/show_bug.cgi?id=96790

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Please attach the corresponding Xorg log file and output of glxinfo and dmesg.

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[Bug 96790] frame stuttering in ut2004

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https://bugs.freedesktop.org/show_bug.cgi?id=96790

--- Comment #2 from network723@rkmail.ru ---
Created attachment 124884
  --> https://bugs.freedesktop.org/attachment.cgi?id=124884&action=edit
dmesg

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[Bug 96790] frame stuttering in ut2004

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https://bugs.freedesktop.org/show_bug.cgi?id=96790

--- Comment #3 from network723@rkmail.ru ---
Created attachment 124885
  --> https://bugs.freedesktop.org/attachment.cgi?id=124885&action=edit
Xorg.log

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[Bug 96790] frame stuttering in ut2004

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https://bugs.freedesktop.org/show_bug.cgi?id=96790

--- Comment #4 from network723@rkmail.ru ---
Created attachment 124886
  --> https://bugs.freedesktop.org/attachment.cgi?id=124886&action=edit
glxinfo

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[Bug 96790] frame stuttering in ut2004

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https://bugs.freedesktop.org/show_bug.cgi?id=96790

--- Comment #5 from network723@rkmail.ru ---
Created attachment 124887
  --> https://bugs.freedesktop.org/attachment.cgi?id=124887&action=edit
lspci

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[Bug 96790] frame stuttering in ut2004

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https://bugs.freedesktop.org/show_bug.cgi?id=96790

--- Comment #6 from network723@rkmail.ru ---
radeon kernel module was patched to provide everything needed for OpenGL
4.3/compute shader. If you want, I may test with vanilla kernel.

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[Bug 96790] frame stuttering in ut2004

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https://bugs.freedesktop.org/show_bug.cgi?id=96790

--- Comment #7 from Michel Dänzer <michel@daenzer.net> ---
Can you run the game with the environment variable


GALLIUM_HUD=fps,requested-VRAM+VRAM-usage,requested-GTT+GTT-usage,cpu+temperature+GPU-load,num-bytes-moved,buffer-wait-time,num-compilations+num-shaders-created

, grab a screenshot within a minute of the framerate dropping below 30 fps, and
attach it here?

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[Bug 96790] frame stuttering in ut2004

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https://bugs.freedesktop.org/show_bug.cgi?id=96790

--- Comment #8 from network723@rkmail.ru ---
Created attachment 124891
  --> https://bugs.freedesktop.org/attachment.cgi?id=124891&action=edit
screenshot

This is closest I could get. Taking the screenshot was a bit tricky. Looks like
GALLIUM_HUD update time is to low to detect fps drops. You can see it in
in-game counter "cur_fps" when it gets violet, but it's almost impossible to
take a screenshot exactly in that moment.

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[Bug 96790] frame stuttering in ut2004

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https://bugs.freedesktop.org/show_bug.cgi?id=96790

--- Comment #9 from Michel Dänzer <michel@daenzer.net> ---
Do the drops correspond to the small bumps on the lowermost graph?

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[Bug 96790] frame stuttering in ut2004

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https://bugs.freedesktop.org/show_bug.cgi?id=96790

--- Comment #10 from network723@rkmail.ru ---
Yes, looks like they do correspond bumps on last graph.

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[Bug 96790] frame stuttering in ut2004

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https://bugs.freedesktop.org/show_bug.cgi?id=96790

--- Comment #11 from Michel Dänzer <michel@daenzer.net> ---
So it looks like the drops are due to shader compilations. Given that you're
using current LLVM SVN & Mesa Git, that should only happen if the application
explicitly asks to compile new shaders. Marek pushed changes to Mesa Git master
this week which might help somewhat, otherwise a persistent shader cache may be
the only hope.

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[Bug 96790] frame stuttering in ut2004

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https://bugs.freedesktop.org/show_bug.cgi?id=96790

Timothy Arceri <t_arceri@yahoo.com.au> changed:

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

--- Comment #12 from Timothy Arceri <t_arceri@yahoo.com.au> ---
We now have both an in memory and on disk shader cache so this situation should
be much better now. Closing.

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