[Bug 97879] [amdgpu] Rocket League: long hangs (several seconds) when loading assets (models/textures/shaders?)

[Bug 97879] [amdgpu] Rocket League: long hangs (several seconds) when loading assets (models/textures/shaders?)

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https://bugs.freedesktop.org/show_bug.cgi?id=97879

Kenneth Graunke <kenneth@whitecape.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         QA Contact|mesa-dev@lists.freedesktop. |dri-devel@lists.freedesktop
                   |org                         |.org
          Component|Other                       |Drivers/Gallium/radeonsi
           Assignee|mesa-dev@lists.freedesktop. |dri-devel@lists.freedesktop
                   |org                         |.org

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[Bug 97879] [amdgpu] Rocket League: long hangs (several seconds) when loading assets (models/textures/shaders?)

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Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Drivers/Gallium/radeonsi    |glsl-compiler
           Assignee|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
                   |.org                        |org
         QA Contact|dri-devel@lists.freedesktop |intel-3d-bugs@lists.freedes
                   |.org                        |ktop.org
                 CC|                            |dri-devel@lists.freedesktop
                   |                            |.org

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Looks like most of the cycles at the start of the apitrace are spent in the
GLSL compiler frontend, in particular in do_common_optimization.

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[Bug 97879] [amdgpu] Rocket League: long hangs (several seconds) when loading assets (models/textures/shaders?)

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--- Comment #2 from Silvan Jegen <s.jegen@gmail.com> ---
(In reply to Michel Dänzer from comment #1)
> Looks like most of the cycles at the start of the apitrace are spent in the
> GLSL compiler frontend, in particular in do_common_optimization.

Just to clarify: the trace also includes loading of the game itself (which
takes a long time too) as well as in-game menu navigation. Loading the in-game
menus (especially the options) takes a long time too so it *could* be related.

I quit the game after about 1 minute of play time so the last one to two
minutes of the trace should be the actual game.

Thanks for looking into it!

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[Bug 97879] [amdgpu] Rocket League: long hangs (several seconds) when loading assets (models/textures/shaders?)

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--- Comment #3 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Silvan Jegen from comment #2)
> Just to clarify: the trace also includes loading of the game itself (which
> takes a long time too) as well as in-game menu navigation.

Right, replaying the trace crashes for me after the shader compilations on
startup, so my CPU profile only covered that. Maybe you can try getting a CPU
profile of one of the other stalls.

Otherwise, maybe try setting the environment variable
GALLIUM_HUD=.dfps,requested-VRAM+VRAM-usage,requested-GTT+GTT-usage,cpu+temperature+GPU-load,.dnum-bytes-moved,.dbuffer-wait-time,.dnum-compilations+num-shaders-created
for either running the game itself or replaying the trace, and taking a
screenshot within one minute after one of the other stalls. That should allow
at least confirming or ruling out that the other stalls are due to shader
compilation as well.

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[Bug 97879] [amdgpu] Rocket League: long hangs (several seconds) when loading assets (models/textures/shaders?)

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--- Comment #4 from Andreas Hartmetz <ahartmetz@gmail.com> ---
I have the same problem. Assuming the problem was shader compilation, what
could be done about it, though? Optimizing shader compilation by a factor of 10
seems unrealistic, a disk cache for shaders has been rejected (right?) and
would not always help, e.g. when somebody with a car that uses a new asset
joins.

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[Bug 97879] [amdgpu] Rocket League: long hangs (several seconds) when loading assets (models/textures/shaders?)

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--- Comment #5 from Tobias Droste <tdroste@gmx.de> ---
Created attachment 126715
  --> https://bugs.freedesktop.org/attachment.cgi?id=126715&action=edit
Screenshot with GALLIUM_HUD of the first 10s of the game (bad)

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--- Comment #6 from Tobias Droste <tdroste@gmx.de> ---
Created attachment 126716
  --> https://bugs.freedesktop.org/attachment.cgi?id=126716&action=edit
Screenshot with GALLIUM_HUD of the first 1min30s of the game (good)

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[Bug 97879] [amdgpu] Rocket League: long hangs (several seconds) when loading assets (models/textures/shaders?)

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--- Comment #7 from Tobias Droste <tdroste@gmx.de> ---
Created attachment 126717
  --> https://bugs.freedesktop.org/attachment.cgi?id=126717&action=edit
Screenshot with GALLIUM_HUD of the first 2min30s of the game (good)

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--- Comment #8 from Tobias Droste <tdroste@gmx.de> ---
On the first screenshot you can clearly see the FPS going down to 0 multiple
times. 
Though looking at the graph only the first 2 drops could be explained by shader
compiles if I interpret this correctly. I can't tell what's happening after
that.

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--- Comment #9 from Tobias Droste <tdroste@gmx.de> ---
Ah should have mentioned it:

This is with radeon+radeonsi (no amdpgu) so it's probably not the kernel.

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--- Comment #10 from Silvan Jegen <s.jegen@gmail.com> ---
(In reply to Michel Dänzer from comment #3)
> (In reply to Silvan Jegen from comment #2)
> > Just to clarify: the trace also includes loading of the game itself (which
> > takes a long time too) as well as in-game menu navigation.
> 
> Right, replaying the trace crashes for me after the shader compilations on
> startup, so my CPU profile only covered that. Maybe you can try getting a
> CPU profile of one of the other stalls.

I tried to replay the trace and it crashed on my machine as well...


> Otherwise, maybe try setting the environment variable
> GALLIUM_HUD=.dfps,requested-VRAM+VRAM-usage,requested-GTT+GTT-usage,
> cpu+temperature+GPU-load,.dnum-bytes-moved,.dbuffer-wait-time,.dnum-
> compilations+num-shaders-created for either running the game itself or
> replaying the trace, and taking a screenshot within one minute after one of
> the other stalls. That should allow at least confirming or ruling out that
> the other stalls are due to shader compilation as well.

Do you still need such a screenshot now that other people in the thread have
posted a few? If so, I will upload one early next week (I will be away over the
weekend).

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--- Comment #11 from Gregor Münch <gr.muench@gmail.com> ---
Experiencing same problem with Radeon HD 7970 Mesa Git radeonsi, LLVM Git,
Linux 4.8 rc6.

The Hangs are always there when:
-start of the match 5-7sec
-multiple times within the 1st minute of the game, up to 10sec per stall
-upon the first explosion
-upon a new player, with a new car spawns
-opening option menu
-end of the game, where the results are displayed

Especially in the begin, you see a lot of blurrish textures. Ground textures,
decals of the car, blurry "psyonix" advertisements.
The grass looks like in a cell shading game, (wrong shader applied?)

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--- Comment #12 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Andreas Hartmetz from comment #4)
> Assuming the problem was shader compilation, what could be done about it,
> though? Optimizing shader compilation by a factor of 10 seems unrealistic,

Not necessarily. Let's worry about that once the code taking so much time is
identified and analyzed. For that purpose, what's needed next is CPU profiles
of the stalls.


> a disk cache for shaders has been rejected (right?)

No, it hasn't.


> and would not always help, e.g. when somebody with a car that uses a new
> asset joins.

Right, there's only so much the driver stack can do when the game (engine)
keeps compiling shaders.

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--- Comment #13 from hofmann.zachary@gmail.com ---
I can also confirm this problem with Radeon R7 250 (radeonsi), Mesa 12.0.2,
LLVM 3.8.1 and kernel version 4.6.0.

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--- Comment #14 from Tobias Droste <tdroste@gmx.de> ---
Created attachment 126770
  --> https://bugs.freedesktop.org/attachment.cgi?id=126770&action=edit
Profile of the the first few seconds of a game (all components)

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--- Comment #15 from Tobias Droste <tdroste@gmx.de> ---
Created attachment 126771
  --> https://bugs.freedesktop.org/attachment.cgi?id=126771&action=edit
Profile of the the first few seconds of a game (only radeonsi)

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--- Comment #16 from Tobias Droste <tdroste@gmx.de> ---
I tried to do some profiling but with callgrind it's impossible because after
half an hour I'm not even in the game creation menu.

I tried zoom as an alternative (never used it before) and the attached
screenshots are the result. I'm not 100% sure I used it how I should use it,
but maybe someone can see something there.

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--- Comment #17 from Tobias Droste <tdroste@gmx.de> ---
Created attachment 126772
  --> https://bugs.freedesktop.org/attachment.cgi?id=126772&action=edit
Profile of a few seconds in the middle of the game (all components)

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--- Comment #18 from Tobias Droste <tdroste@gmx.de> ---
Created attachment 126773
  --> https://bugs.freedesktop.org/attachment.cgi?id=126773&action=edit
Profile of a few seconds in the middle of the game (only radeonsi)

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--- Comment #19 from Tobias Droste <tdroste@gmx.de> ---
And I added screenshots of the profile for a few seconds where the game is
running fine. 
I figured that it might be interesting where the difference between good and
bad is.

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--- Comment #20 from Eero Tamminen <eero.t.tamminen@intel.com> ---
Apitrace's own CPU overhead is so high that it's not very good for identifying
CPU bottlenecks.

Best would be to do (e.g. from SSH console):
  # perf record -a
  ^C

During the game freeze.

And provide profile report here:
  # perf report

(+ install debug symbols for anything that misses symbols in the report.)

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--- Comment #21 from Silvan Jegen <s.jegen@gmail.com> ---
(In reply to Eero Tamminen from comment #20)
> Best would be to do (e.g. from SSH console):
>   # perf record -a
>   ^C
> 
> During the game freeze.

I have a dual screen setup and ran 'perf record -a' on a terminal on the screen
that the game was not running on. I captured events for a short amount of time
during which the game was mostly stalling/freezing.


> And provide profile report here:
>   # perf report
> 
> (+ install debug symbols for anything that misses symbols in the report.)

I uploaded the perf report.

Most of the CPU time seems to be spent in RocketLeague itself for which there
are no symbols available.

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--- Comment #22 from Silvan Jegen <s.jegen@gmail.com> ---
Created attachment 126796
  --> https://bugs.freedesktop.org/attachment.cgi?id=126796&action=edit
perf report of RocketLeague stalling/freezing

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--- Comment #23 from Michel Dänzer <michel@daenzer.net> ---
Please pass --call-graph to perf record (you may need to play with the
different methods supported by that to find the one which works best for you,
see perf record --help) and perf report.

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--- Comment #24 from Silvan Jegen <s.jegen@gmail.com> ---
(In reply to Michel Dänzer from comment #23)
> Please pass --call-graph to perf record (you may need to play with the
> different methods supported by that to find the one which works best for
> you, see perf record --help) and perf report.

Looks like my perf is linked to libunwind so according to 'perf help record' I
should be able to run 'perf record --call-graph dwarf -a' during the stall and
generate a CPU profile report including the call graphs. I will do so later
today.

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--- Comment #25 from Silvan Jegen <s.jegen@gmail.com> ---
Created attachment 126813
  --> https://bugs.freedesktop.org/attachment.cgi?id=126813&action=edit
perf report of RocketLeague stalling/freezing, including callgraphs

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--- Comment #26 from Silvan Jegen <s.jegen@gmail.com> ---
I generated the report and uploaded the result.

I may have hit a bug in perf while doing it. "perf report" was blocking on a
pread64 call on /dev/dri/card0 when creating the report. I had to use gdb to
close the associated file descriptor to get perf to continue creating the
report but it seems to have worked.

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--- Comment #27 from Eero Tamminen <eero.t.tamminen@intel.com> ---
(In reply to Silvan Jegen from comment #22)
> Created attachment 126796 [details]
> perf report of RocketLeague stalling/freezing

Overview:
---------------------------------
 74.86% RocketLeague
     76.73% RocketLeague
     16.33% [kernel.vmlinux]
      2.05% libc-2.24.so
      1.79% libpthread-2.24.so
      1.59% [amdgpu]

 10.22% RenderingThread
     46.08% radeonsi_dri.so
     22.35% RocketLeague
     15.32% libc-2.24.so
      8.99% libpthread-2.24.so
      2.07% [amdgpu]
      1.50% libGL.so.1.2.0
      1.50% [kernel.vmlinux]

  6.86% swapper
     97.25% [kernel.vmlinux]
      2.58% [xhci_hcd]

  6.81% AsyncIOSystem
     99.83% RocketLeague
---------------------------------

-> If the perf data is just from the freeze(s), I'm not sure the problem here
is compiler.

(With the "-n" option given to "perf report" this overview could be much more
accurate than calculating the info from the rounded percentages in the
attachment.)

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--- Comment #28 from Micael Bergeron <micaelbergeron@gmail.com> ---
I can reproduce this every time. 
Using amdgpu-pro seems to fix the problem.

I asked Psyonix for the debug symbols bug had no response.
http://psyonix.com/forum/viewtopic.php?f=36&t=27894

I opened a bug report on Rocket League for the menu freeze.
https://support.rocketleaguegame.com/hc/en-us/requests/1840

Shaders/materials seems to load very slowly compared to the Windows version.

Software:
Linux 4.7.4-1-ARCH #1 SMP PREEMPT Thu Sep 15 15:24:29 CEST 2016 x86_64
GNU/Linux
mesa 12.0.3-1

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--- Comment #29 from Silvan Jegen <s.jegen@gmail.com> ---
(In reply to Micael Bergeron from comment #28)
> I asked Psyonix for the debug symbols bug had no response.
> http://psyonix.com/forum/viewtopic.php?f=36&t=27894

Maybe you can add a link to this bug report on their support forums? I have
seen that people at Feral that do ports to Linux have commented on mesa bug
reports about the games they are porting.

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--- Comment #30 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Eero Tamminen from comment #20)
> Apitrace's own CPU overhead is so high that it's not very good for
> identifying CPU bottlenecks.

That may be true in general, but taking a CPU profile while replaying the
referenced apitrace clearly shows that most of the CPU cycles during the
startup phase are spent in the GLSL compiler frontend code for me. Can't you
reproduce that?

Anyway, it looks like there may be at least one other, not shader compilation
related, issue at play here. But that doesn't mean nothing can be done about
the shader compilation issue.

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--- Comment #31 from Marek Olšák <maraeo@gmail.com> ---
Please create apitrace while this environment variable is set:
MESA_EXTENSION_OVERRIDE="-GL_ARB_buffer_storage -GL_AMD_pinned_memory"

Then check that the apitrace replays correctly. If it does, please attach it.
Thanks.

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--- Comment #32 from Micael Bergeron <micaelbergeron@gmail.com> ---
(In reply to Marek Olšák from comment #31)

> Please create apitrace while this environment variable is set:
> MESA_EXTENSION_OVERRIDE="-GL_ARB_buffer_storage -GL_AMD_pinned_memory"
> 
> Then check that the apitrace replays correctly. If it does, please attach
> it. Thanks.

Here is my attempt to provide the needed apitrace. As they are large files,
even compressed, I uploaded them to an external service. 

*Files will be deleted in 30 days.*

I made 2 apitrace, 

1) when you click on the Option menu and "High Quality" shaders are on. You can
reproduce this by setting the "High Quality" shaders on then clicking again on
Options.

2) when you enter a game, there is a long delay in the game loading, it hangs
for multiples seconds at a time, multiple times until it settles. From my PoV,
it seems to have something to do with the HUD.

I haven't been able to replay the apitrace, as I'm not too familiar with this
tool, maybe someone can fix the traces or something. I guess it's better than
having nothing.

Hit me up if you need anything else, thanks for your time.

1) https://ufile.io/2a49
2) https://ufile.io/0cf6

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--- Comment #33 from Marek Olšák <maraeo@gmail.com> ---
The traces don't work. Let's assume it's an apitrace bug.

Running the traces can be done with: glretrace --benchmark [trace file]
glretrace is part of apitrace.

We can at least profile the compiler:
- please create an empty directory
- point this environment variable to it:
MESA_SHADER_CAPTURE_PATH=[path]
- play the game for a while... after that, the directory should contain a lot
of shader files
- please pack the directory and attach it

Thanks.

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--- Comment #34 from Micael Bergeron <micaelbergeron@gmail.com> ---
Created attachment 127319
  --> https://bugs.freedesktop.org/attachment.cgi?id=127319&action=edit
Shaders output folfer

MESA_SHADER_CAPTURE_PATH output folder.

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--- Comment #35 from Marek Olšák <maraeo@gmail.com> ---
Well, it's unreal engine 3, so it doesn't surprise me that it compiles shaders
on demand. All UE3 games are affected in the same way.

Possible solution 1:
- persistent shader cache on the disk

Possible solution 2:
- convert shaders from TGSI to ISA in Mesa (we can use the LLVM assembler, but
we need good register allocation for TGSI)
- LLVM compilation should follow and be fully asynchronous

Comments welcome.

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--- Comment #36 from Silvan Jegen <s.jegen@gmail.com> ---
(In reply to Marek Olšák from comment #35)
> Well, it's unreal engine 3, so it doesn't surprise me that it compiles
> shaders on demand. All UE3 games are affected in the same way.
> 
> Possible solution 1:
> - persistent shader cache on the disk
> 
> Possible solution 2:
> - convert shaders from TGSI to ISA in Mesa (we can use the LLVM assembler,
> but we need good register allocation for TGSI)
> - LLVM compilation should follow and be fully asynchronous
> 
> Comments welcome.

Is it save to assume that the amount of shaders to be compiled is what causes
these stalls?

I am not familiar enough with the problem space to be able to tell you which
one would be better. According to the following quote (from further above)

> Micael Bergeron 2016-09-27 16:07:38 UTC
> I can reproduce this every time. 
> Using amdgpu-pro seems to fix the problem.

amdgpu-pro doesn't seem to have this issue. Do we know what AMD does in its
closed driver (persistent shader cache or something else)?

Even if it works for AMD's closed driver it doesn't meant that the same
approach would be feasible for the Open Source one of course.

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--- Comment #37 from Micael Bergeron <micaelbergeron@gmail.com> ---
The number of shaders is quite astonishing.

Could using the r600 shader compiler LLVM (--enable-r600-llvm-compiler) fix
this?

As for the future, I think a persistent shader cache is probably the quickest
way to patch this so the game is enjoyable. After that, a more subtle approach
could be used:

> Possible solution 2:
> - convert shaders from TGSI to ISA in Mesa (we can use the LLVM assembler,
> but we need good register allocation for TGSI)
> - LLVM compilation should follow and be fully asynchronous

Rocket League is a really popular game, which I think the Linux community
should embrace. Thank you guys for making this work.

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--- Comment #38 from Vedran Miletić <vedran@miletic.net> ---
(In reply to Micael Bergeron from comment #37)
> The number of shaders is quite astonishing.
> 
> Could using the r600 shader compiler LLVM (--enable-r600-llvm-compiler) fix
> this?
> 

I don't see this option but judging by the name, this enables LLVM's R600
backend as a shader compiler on EG/NI cards and does not apply for SI+.

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--- Comment #39 from Stefano Cipriani <cip91sk@gmail.com> ---
Playing against bots with an AMD r9 m265x (cape verde) using DRI_PRIME=1
rendered via Intel HD Graphics 4600 the game it's not playable for about 30+
seconds, bot cars start to one every 5~10 seconds. When playing online I get
the hangs for about the same time.

I made a trace of an offline match with the git version of apitrace, and I can
replay it with both git and stable version. You can find it at

https://drive.google.com/open?id=0B41ZZ4daaP9hTmNDaUl2MHFWQlE

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--- Comment #40 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Stefano Cipriani from comment #39)
> https://drive.google.com/open?id=0B41ZZ4daaP9hTmNDaUl2MHFWQlE

While replaying this trace, I only see pauses of fractions of seconds (for
shader compilations) during the match. If someone is seeing pauses of several
seconds when replaying this trace, it would be interesting to see a profile for
one of those pauses.

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--- Comment #41 from Marek Olšák <maraeo@gmail.com> ---
Yeah, the stalls are pretty small with apitrace. I've just pushed patches that
should improve compile times for the GLSL compiler. Before that, the GLSL
compilation speed always decreased with a high memory allocation count in the
process. That may explain why apitrace is faster.

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--- Comment #42 from Evan Black <evan2013@live.com> ---
Can't really contribute much in terms of any of the tracing stuff; just
dropping my specs here as I have similar issues.

Core i5 4690k
R9 285
8 GB Memory

I've tried it both on my SSD and HDD, and the issue was exactly the same:
freezing in the early stages of the match or when new players join the game,
obviously linked to loading their model / textures.

Please keep the search up; I'd love to play this game just as smooth as it runs
on Windows.

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--- Comment #43 from Steven <xksteven@uchicago.edu> ---
I also experience the issue. If someone can explain or point me to how I can
profile it I can also try to provide some api traces.

I'm running 

Mesa 12.0.3
OpenGL renderer string: Gallium 0.4 on AMD HAWAII (DRM 2.46.0 /
4.8.0-27-generic, LLVM 3.8.1)
AMD 290X
intel i7

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--- Comment #44 from Jani Kärkkäinen <jani.karkkainen@gmail.com> ---
I'm quite sure I'm getting this as well. I'm however on a HD6850, so that'd be
the r600 driver I believe?

Anything I can do to help pinpoint the culprit? 

Some specs:
OpenGL renderer string: Gallium 0.4 on AMD BARTS (DRM 2.46.0 / 4.8.7-xanmod9,
LLVM 4.0.0)
OpenGL core profile version string: 3.3 (Core Profile) Mesa 13.1.0-devel -
padoka PPA

Ubuntu Gnome 16.10 64-bit

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--- Comment #45 from Gregor Münch <gr.muench@gmail.com> ---
No change with GIT of today. Slowdowns remain the same.

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--- Comment #46 from George Billios <gbillios@gmail.com> ---
This is also valid for Trine 3.

Big delay to start ~5mins
setting MESA_SHADER_CAPTURE_PATH results in about 16k files!!!

specs
i7 860
Fury R9

4.7-staging kernel 
mesa-git Mesa 13.1.0-devel (git-151aeca)
llvm 3.9.0

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[Bug 97879] [amdgpu] Rocket League: long hangs (several seconds) when loading assets (models/textures/shaders?)

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--- Comment #47 from Marek Olšák <maraeo@gmail.com> ---
The freezes are not caused by shader compilation. I don't know what's causing
them. They are too long (even 10 seconds). A CPU profiler shows the time is not
spent in the driver. It's spent in RocketLeague. The game is doing something
and I can't see what, because it doesn't come with debug info. Some time is
spent in sched_yield, which suggests that the game is in a loop waiting for
something. This issue might not be related to the GL driver even.

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--- Comment #48 from Jani Kärkkäinen <jani.karkkainen@gmail.com> ---
Using AMDGPU-PRO the hangs are non-existent. So there must be SOMETHING in the
whole mesa-driver stack, that causes the hangs, if not the GL drivers
themselves.

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--- Comment #49 from iuno@posteo.net ---
(In reply to Jani Kärkkäinen from comment #48)
> Using AMDGPU-PRO the hangs are non-existent. So there must be SOMETHING in
> the whole mesa-driver stack, that causes the hangs, if not the GL drivers
> themselves.

Actually, I didn't see this huge hangs with Intel.

The game is not playable with radeonsi at this point.

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--- Comment #50 from Marek Olšák <maraeo@gmail.com> ---
It would be useful to have a debug build of the game and run it with a profiler
or debugger to see where it's looping.

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--- Comment #51 from Jani Kärkkäinen <jani.karkkainen@gmail.com> ---
Sent a support ticket to Psyonix about this (and the request for a debug
build). Hopefully a random persons support ticket gets to the dev team and they
deem it something that's in the realm of possibility. On a good note, already
got a positive response from the first-level support, so, fingers crossed. :D

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--- Comment #52 from Marek Olšák <maraeo@gmail.com> ---
We don't need a debug build. We just need:
1) One person to run the debug build and use sysprof to capture where the CPU
is spending time during the freeze.
2) Make a screenshot of the sysprof window and send it to the game developer.
3) The game developer should look at it and decide what to do next.

sysprof is a very-easy-to-use standalone CPU profiler GUI that you run under
root. It's observing all processes and also the kernel. For apps built with -g
(but also keep -O2 at least), it will show the functions and % of CPU time
spent in them. For apps also built with -fno-omit-frame-pointer, it will show
whole call stacks.

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--- Comment #53 from Timothee Besset <ttimo@ttimo.net> ---
Hello! I have started working on this. I haven't found the root cause yet but I
will update here when I have something.

(For context, I did the initial port work for Psyonix. I just recently got a
radeonsi setup together so I can look at this now.)

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--- Comment #54 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Marek Olšák from comment #52)
> 2) Make a screenshot of the sysprof window and send it to the game developer.

Please save the profile in sysprof and send the saved data instead of a
screenshot. Then the recipient can peruse the profile any way they like.

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--- Comment #55 from Timothee Besset <ttimo@ttimo.net> ---
Rocket League uses an async I/O thread to stream in content in the background.
That thread works off of a queue and only does disk reads and decompression (it
doesn't issue any OpenGL calls for instance, that happens on a dedicated render
thread).

The CPU usage you are seeing out of Rocket League is this thread being busy
with decompression. This is generally normal and not an indication of a
problem.

However, when running with radeonsi, the async I/O thread is performing very
poorly. Much, much worse than with amdgpupro. To the point that the main thread
has to wait for async and causes a significant hitch (up to 4 seconds in some
logs I captured).

I tend to agree that this problem is not related to shader compilation. The
bumps from shader compilation are barely showing up in profiles. But it's
definitely made a lot worse by running on radeonsi. On the same system with
amdgpupro those same hitches can happen but they are in the 100/200ms range.

At this point of the investigation, and due to scheduling constraints, I am
likely only going to come back to this once Timothy Arceri has a shader cache
implementation available. I suspect this will not help significantly but let's
hope I'm wrong there.

In the meantime there are some log files from the async thread compared between
radeonsi and amdgpu-pro if someone feels like extracting some possibly useful
data:

https://www.dropbox.com/s/d73jk66uhfrhv8l/amdgpupro-compressedread-timings.log?dl=0
https://www.dropbox.com/s/1xfl3l24f5buzs0/radeonsi-compressedread-timings.log?dl=0

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--- Comment #56 from Grazvydas Ignotas <notasas@gmail.com> ---
Is the async I/O thread doing a lot of memory allocations?

If so, perhaps the malloc implementation is slowed down by having large amount
of small allocs/frees from shader compiles and/or fragmentation of it's free
space. I wonder if it's possible to put mesa on a separate allocator without
affecting the rest of the app.
If the game is 32bit, it could also be that the address space is almost fully
mapped and mmap is struggling to find holes to fit the new allocations in.

Just some random guesses there.

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--- Comment #57 from Vladislav Egorov <vegorov180@gmail.com> ---
Simple way to reproduce the bug - launch the game, then go to "Options" menu
and get multi-second (>5s) freeze.

I've tried to launch Rocket League on several GPUs. Graphics settings were the
same everywhere. I wasn't able to reproduce the bug on i965 (Haswell), nouveau
(GT710) and llvmpipe, it takes maybe 1 second to load "Options" menu on these
drivers. I've reproduced the bug on radeonsi (R270X) and r600g (6930). The bug
is reproducible on both radeon+radeonsi and amdgpu+radeonsi on fresh 4.9
kernel.

So it's very unlikely it has anything to do with memory allocation or shader
compilation at all. Shader cache would not help either. Narrowing the circle of
suspects a bit more. LLVM can't be related, because the bug is reproducible on
r600. Gallium is unlikely related, because I don't see the bug on llvmpipe and
nouveau. That's something common to R600 and radeonsi.

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--- Comment #58 from Vladislav Egorov <vegorov180@gmail.com> ---
Correction - in fact I only tested radeon+radeonsi pair. I will try
amdgpu+radeonsi later.

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--- Comment #59 from Andreas Hartmetz <ahartmetz@gmail.com> ---
Another random guess: Maybe shader compilation is a problem insofar that it
blocks in a different GL API call than in other drivers, which causes some lock
to be held for much longer. Then the I/O thread won't find the lock free to
submit a result when it expects to.
That would require the GL / I/O thread synchronization to be done in a
suboptimal way - the right synchronization primitives and techniques would
avoid such problems.

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--- Comment #60 from Iaroslav Andrusyak <pontostroy@gmail.com> ---
if it help rocket league in wine(gallium-nine) works fine without hangs

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Marek Olšák <maraeo@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|mesa-dev@lists.freedesktop. |dri-devel@lists.freedesktop
                   |org                         |.org
            Version|12.0                        |git
         QA Contact|intel-3d-bugs@lists.freedes |dri-devel@lists.freedesktop
                   |ktop.org                    |.org
          Component|glsl-compiler               |Drivers/Gallium/radeonsi

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--- Comment #61 from Marek Olšák <maraeo@gmail.com> ---
Created attachment 129379
  --> https://bugs.freedesktop.org/attachment.cgi?id=129379&action=edit
patch - possible workaround

Does the attached patch help?

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--- Comment #62 from lod <freedesktop@bremsspur.org> ---
the patch kind of works for me.
The Game loads much faster now, so does the options menu and I can play the
game without any lags, but know I only get 30-40fps (60+ before) at Radeon
6950(r600g)

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--- Comment #63 from Marek Olšák <maraeo@gmail.com> ---
OK. Let's wait for more people to report the same findings.

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--- Comment #64 from freedesktop@bremsspur.org ---
Got it tested on another system with a rx470.
The hangs are mostly gone, but fps drops from 60+ to ~25. (btw the patch was
applied to mesa 13.0.0.4)

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--- Comment #65 from Andrei.Demin1996@gmail.com ---
> Got it tested on another system with a rx470.
>The hangs are mostly gone, but fps drops from 60+ to ~25. (btw the patch was >applied to mesa 13.0.0.4)
Yep, same. FPS drops from 60+ to 30-40 FPS, the hangs are mostly gone, but some
still there.
MESA 13.0.3
RX 480

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--- Comment #66 from Captain Crutches <captaincrutches@gmail.com> ---
I'm having the same results as everyone else with the patch: hanging seems
diminished, FPS down noticeably (in multiplayer, not free play) but still
playable.

Patched mesa 17.0_rc2
R9 290

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--- Comment #67 from Michel Dänzer <michel@daenzer.net> ---
The patch forces most buffers to GTT, which is clearly a bad idea with a
dedicated GPU.

Marek, what theory did you want to test with this patch?

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--- Comment #68 from Marek Olšák <maraeo@gmail.com> ---
The long hangs are spent in an upload/decompression thread the game uses. The
thread doesn't use any GL calls.

My theory that's now confirmed was that the game maps buffers in VRAM and does
read-modify-write on that memory in that thread. We know that direct VRAM
access is uncached and super slow if it's not a series of sequential writes
that is write-combined on the CPU, which is like a write-only cache. Games
typically upload data using a sequential copy/fill, which is why we had not
seen this issue before.

If the game used the MAP READ flag, the driver would return a mapping in RAM
with caching enabled. You'll also get that if you set the CLIENT STORAGE bit in
glBufferStorage.

For completeness, you can also get a mapping in RAM that's uncached. The CPU
and GPU performance is somewhere between the VRAM and cached RAM. We use it for
streaming because the GPU has faster access to RAM uncached by the CPU.

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--- Comment #69 from Marek Olšák <maraeo@gmail.com> ---
Actually, the only way to get cached RAM is to map a buffer with
GL_MAP_READ_BIT. There is no other way.

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[Bug 97879] [amdgpu] Rocket League: long hangs (several seconds) when loading assets (models/textures/shaders?)

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--- Comment #70 from Captain Crutches <captaincrutches@gmail.com> ---
So, at the risk of sounding ignorant, does that mean the bug actually belongs
to Psyonix because they're just doing it inefficiently, or is there still
something that can be done on the Mesa side?

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--- Comment #71 from Marek Olšák <maraeo@gmail.com> ---
The current heuristic in Mesa is that if a buffer is not mapped for read, Mesa
doesn't enable CPU caches for the mapping. It's usually an optimal solution for
write-only buffer uploads.

Enabling CPU caches for mapped buffers adds a lot of inefficiencies, so it
should be avoided.

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--- Comment #72 from Marek Olšák <maraeo@gmail.com> ---
If the game does any reads or read-modify-write on the mapped buffer memory and
doesn't use the GL_MAP_READ_BIT, it's a bug in the game.

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--- Comment #73 from Clemens Eisserer <linuxhippy@gmail.com> ---
just to be curious, does it actually map the buffer with the READ flag?

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--- Comment #74 from iuno@posteo.net ---
Do you need more testing?

Has anyone yet reported that to psyonix?

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--- Comment #75 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Clemens Eisserer from comment #73)
> just to be curious, does it actually map the buffer with the READ flag?

According to Timothee and the apitrace it does, so
https://patchwork.freedesktop.org/patch/138047/ should help for this issue.

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--- Comment #76 from fin4478@hotmail.com ---
I tested the game and with default video settings it did hang sometimes, but
dialing video settings down, the Rocket League works fine with Debian testing
Xfce. Oipaf ppa and custom adg5f drm-next-4.11-wip kernel. Rx 460 is my gpu and
I have tweaked the kernel to be fast and stable, see:
https://bugzilla.kernel.org/show_bug.cgi?id=193651

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--- Comment #77 from freedesktop@bremsspur.org ---
(In reply to Michel Dänzer from comment #75)
> (In reply to Clemens Eisserer from comment #73)
> > just to be curious, does it actually map the buffer with the READ flag?
> 
> According to Timothee and the apitrace it does, so
> https://patchwork.freedesktop.org/patch/138047/ should help for this issue.

it helps, but fps drops quite a bit on my aged r660g gpu (patch applied to mesa
13.0.4). It runs better as Mareks test did before, so maybe it works out for
newer hardware.

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--- Comment #78 from Timothee Besset <ttimo@ttimo.net> ---
Testing a game side fix for this problem atm (doesn't require the patched
drivers). If someone wants to give it a spin before I send it to Psyonix, catch
me on freenode (TTimo).

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--- Comment #79 from Timothee Besset <ttimo@ttimo.net> ---
(testing done - it may take a few days before this rolls out in a steam update)

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--- Comment #80 from Jani Kärkkäinen <jani.karkkainen@gmail.com> ---
I think this is merged now? 

Using the padoka git ppa which just so happened to be updated, which included
this patch (as it was just merged?), I can confirm the findings others had. The
lag spikes effectively disappeared, but fps dropped to about 80% (on the lowest
settings, to be fair). 

What's interesting though is that now it was possible to set the highest
quality (before the patch it just lagged for me for double digit seconds, just
for setting it up), and if I remember correctly, the fps was horrid, about half
of the lowest settings. But now I can play just fine with 1080p quality maxed @
74 fps.

Also, before the patch the fps was quite stable, but now it fluctuates a lot
more. It doesn't affect the gameplay negatively, though.

Testing this on RX480.

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--- Comment #81 from Marek Olšák <maraeo@gmail.com> ---
I merged a different patch that just improves GL_MAP_READ_BIT and returns a
mapping with CPU caches enabled, with the downside that it does a copy from the
uncached buffer into a cached temporary buffer, maps that, and if
GL_MAP_WRITE_BIT is set, the temporary buffer is copied into the original
buffer on unmap.

The reason GPU drivers prefer uncached allocations is that the GPU access to
the buffer is faster while the CPU access is slower (except for sequential
writes). If we enabled caching, the GPU access would be slower, but the CPU
access would be faster. Or we could have 2 buffers and do copying back and
forth like for GL_MAP_READ_BIT, but again the copy also isn't free and it's
worse if you have to do 2 copies - one in Map and the other in Unmap.

The malloc + memcpy solution on the app side is probably the best one.

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--- Comment #82 from Timothee Besset <ttimo@ttimo.net> ---
Thanks Marek. The game has been updated to use a malloc and memcpy, this fix
will have rolled out to everyone by now.

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Michel Dänzer <michel@daenzer.net> changed:

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

--- Comment #83 from Michel Dänzer <michel@daenzer.net> ---
Thanks for the report and everyone's cooperation in getting it resolved. Fixed
in Git master:

Module: Mesa
Branch: master
Commit: d86099df0af7c22c8acfd48b38ad446d9c8df6bd
URL:   
http://cgit.freedesktop.org/mesa/mesa/commit/?id=d86099df0af7c22c8acfd48b38ad446d9c8df6bd

Author: Marek Olšák <marek.olsak@amd.com>
Date:   Thu Feb  9 03:14:22 2017 +0100

gallium/radeon: fix performance of buffer readbacks

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--- Comment #84 from Marek Olšák <maraeo@gmail.com> ---
Michel, the commit in master doesn't fix it. It was fixed in the game by using
mallocd memory for the upload process and then memcpy into the buffer.
Therefore, the game doesn't need to use the read flag and doesn't do
read-modify-write on mapped memory.

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--- Comment #85 from Jani Kärkkäinen <jani.karkkainen@gmail.com> ---
Well this is confusing. The client update hasn't rolled out to me on steam yet
(the last modified date of the RocketLeague -binary is 31st of January, so
about 2 weeks old), but by updating to a more recent mesa (where the buffer fix
is inplace) the game's lag spikes have been definitely fixed. Also, the lag
spikes were gone only after updating the drivers.

It can't be the client, so it must be the drivers, right?

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--- Comment #86 from Marek Olšák <maraeo@gmail.com> ---
In that case, Michel is right.

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--- Comment #87 from Andreas Hartmetz <ahartmetz@gmail.com> ---
For the record, the game side fix has NOT been shipped by Steam yet, at least
for me, in Germany, not on a beta program. In case anyone else gets confused.

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--- Comment #88 from freedesktop@bremsspur.org ---
(In reply to Andreas Hartmetz from comment #87)
> For the record, the game side fix has NOT been shipped by Steam yet, at
> least for me, in Germany, not on a beta program. In case anyone else gets
> confused.

it's not public yet https://steamdb.info/app/252950/depots/

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--- Comment #89 from Tobias Droste <tdroste@gmx.de> ---
So today came a game update and I can also confirm that the long pauses at the
beginning are gone. But there's still a small pause (<1s) every 2 or 3s now and
not only at the beginning. 

Do you think it's a separate issue? (Mesa git from today)

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--- Comment #90 from Marek Olšák <maraeo@gmail.com> ---
(In reply to Tobias Droste from comment #89)
> So today came a game update and I can also confirm that the long pauses at
> the beginning are gone. But there's still a small pause (<1s) every 2 or 3s
> now and not only at the beginning. 
> 
> Do you think it's a separate issue? (Mesa git from today)

You can find that out by yourself with Gallium HUD queries such as
num-compilations for the shader compiler and num-bytes-moved, which is TTM
activity.

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--- Comment #91 from Andreas Hartmetz <ahartmetz@gmail.com> ---
Steam has now shipped the game side fix as well.
It feels almost like a new game, much much better.

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--- Comment #92 from libgradev@gmail.com ---
Working great here now guys - latest RL build and Mesa git.

Thanks to all involved - great cooperation :)

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