[Bug 92806] 1 second freezes during new effects UT4

[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

            Bug ID: 92806
           Summary: 1 second freezes during new effects UT4
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: bellamorte42@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

I encountered this bug months ago but I wasn't sure if it was just UT4 or Mesa.
 Before I would see 3 to 5 second freezes when a new effect was being rendered
for the first time.  A new effect being a weapon firing, an impact occuring
(explosions etc), or even the alternate fire on the enforcer would cause it as
well even if I've use the normal fire previously.  Needless to say, this made
the first 2-3 minutes of any match unplayable as an enemy player would enter a
room using a weapon I hadn't 'loaded' previously and I would be dead without
being able to react or even fire a shot.  It was a Mesa update a couple months
ago that reduced the freeze time to about 1 second.  It's still pretty
horrible.

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #1 from Ernst Sjöstrand <ernstp@gmail.com> ---
I guess apitrace could find out what's going on... ?

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #2 from Michel Dänzer <michel@daenzer.net> ---
Please set the environment variable
GALLIUM_HUD=num-compilations,num-shaders-created,buffer-wait-time,num-bytes-moved,requested-VRAM+VRAM-usage,requested-GTT+GTT-usage
for running the game and let us know which of the graphs show spikes
corresponding to the freezes.

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #3 from bellamorte42@gmail.com ---
Num compilations showed spikes corresponding to the feezes.  Sometimes it was
accompanied by a spike in shader compilation, but not the majority.

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #4 from bellamorte42@gmail.com ---
As an additional note, the num compilations spikes were only 2-6 during these
freezes.  Also apitrace didn't show any errors during this time.

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #5 from Michel Dänzer <michel@daenzer.net> ---
So it looks like the freezes are due to delayed shader compilations in the
radeonsi driver (and to a lesser extent in the Mesa state tracker). Marek Olšák
has been working on improving this (which is probably the main reason why it's
a little better now), but it'll probably take a while until delayed shader
compilations are completely eliminated.

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #6 from Michel Dänzer <michel@daenzer.net> ---
Meanwhile, make sure you're not using a debugging build of LLVM.

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #7 from bellamorte42@gmail.com ---
Are num compilations the same as shader compilations?  Also iirc I had the same
issue on my 6950 system so it might not be radeonsi specific.

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
A num-compilations spike without a num-shaders-created spike means the shader
compile was triggered by the driver, either because UT4 used the GLSL shader
for the first time or because UT4 changed some OpenGL state affecting the code
generated for the shader.

A num-compilations spike with a num-shaders-created spike means the shader
compile was triggered by the state tracker or by UT4 itself.

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #9 from bellamorte42@gmail.com ---
Thaanks for the info.  Should I close this or wait for the problem to be
resolved?

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #10 from Michel Dänzer <michel@daenzer.net> ---
Bug reports are normally only resolved when the problem is fixed.

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

famo <richard.llom@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |richard.llom@gmail.com
                URL|                            |https://wiki.unrealengine.c
                   |                            |om/Linux_Demos

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #11 from bellamorte42@gmail.com ---
Update
Huge improvement with the shader cache (Great job Marek), but the issue is
still present and detrimental.  The first 10 seconds of the game is unplayable,
and <1 second freezes (usually when in combat) still persist for the first
couple of minutes after.

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #12 from Marek Olšák <maraeo@gmail.com> ---
(In reply to bellamorte42 from comment #11)
> Update
> Huge improvement with the shader cache (Great job Marek), but the issue is
> still present and detrimental.  The first 10 seconds of the game is
> unplayable, and <1 second freezes (usually when in combat) still persist for
> the first couple of minutes after.

Yes, that's expected. The issue can only be fixed with an on-disk shader cache.
It won't help with the first run (that's unfixable), but it should help with
all subsequent runs.

I guess Unreal Engine was designed with the assumption that the first run will
always be unpleasant and all the rest should be fine as long as the driver
isn't updated.

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #13 from famo <richard.llom@gmail.com> ---
Can someon explain when (where) the updates land?

Because I can't see any improvement here:
Kernel: 4.5.7-1-CHAKRA x86_64 (64 bit) 
Graphics:  Card: Advanced Micro Devices [AMD/ATI] Bonaire XTX [Radeon R7 260X]
Display Server: X.Org 1.17.4
driver: radeon
GLX Renderer: Gallium 0.4 on AMD BONAIRE (DRM 2.43.0 / 4.5.7-1-CHAKRA, LLVM
3.7.0)
GLX Version: 3.0 Mesa 12.0.1

ty

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #14 from Nicolai Hähnle <nhaehnle@gmail.com> ---
You need at least LLVM 3.8 (and Mesa re-built to link against it) to benefit
from the existing shader improvements. A full shader cache is still missing

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

--- Comment #15 from Marek Olšák <maraeo@gmail.com> ---
If you have OpenGL 4.3 (LLVM 3.9 needed), UE4 should no longer compile shaders
on demand or not do that so often.

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[Bug 92806] 1 second freezes during new effects UT4

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https://bugs.freedesktop.org/show_bug.cgi?id=92806

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|dri-devel@lists.freedesktop |t_arceri@yahoo.com.au
                   |.org                        |

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