[Mesa-dev] [Bug 103126] glthread doesn't offload anything in Witcher 2

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=103126

--- Comment #5 from Timothy Arceri  ---
(In reply to Marek Olšák from comment #4)
> I don't think this has anything to do with 32 bits. There are 32-bit apps
> where glthread works. Witcher 2 is an app where glthread gets disabled.

Yeah it's not a 32bit issue apparently glthread doesn't work with --disable-asm

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[Mesa-dev] [Bug 103126] glthread doesn't offload anything in Witcher 2

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=103126

--- Comment #4 from Marek Olšák  ---
I don't think this has anything to do with 32 bits. There are 32-bit apps where
glthread works. Witcher 2 is an app where glthread gets disabled.

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[Mesa-dev] [Bug 103126] glthread doesn't offload anything in Witcher 2

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=103126

Timothy Arceri  changed:

   What|Removed |Added

 Resolution|--- |INVALID
 Status|NEW |RESOLVED

--- Comment #3 from Timothy Arceri  ---
I believe the dispatch code uses asm, disabling it probably falls back to a
dispatch path that doesn't contain glthread. Either that or something else
glthread related relies on asm being enabled. Either way this doesn't seem like
a bug. Closing.

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[Mesa-dev] [Bug 103126] glthread doesn't offload anything in Witcher 2

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=103126

--- Comment #2 from Alexander Tsoy  ---
I had the same problem with other eON ports: Spec Ops: The Line and Overlord at
least. It's turned out that it's due to disabled assembly in my 32-bit mesa
build (--disable-asm). Not sure if it worth fixing this. Leaving the bug open
for developers to decide.

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[Mesa-dev] [Bug 103126] glthread doesn't offload anything in Witcher 2

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=103126

mirh  changed:

   What|Removed |Added

 CC||m...@protonmail.ch

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[Mesa-dev] [Bug 103126] glthread doesn't offload anything in Witcher 2

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=103126

--- Comment #1 from Alexander Tsoy  ---
My GPU:
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Tonga PRO [Radeon R9 285/380] [1002:6939] (rev f1) (prog-if 00 [VGA
controller])

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[Mesa-dev] [Bug 103126] glthread doesn't offload anything in Witcher 2

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=103126

Bug ID: 103126
   Summary: glthread doesn't offload anything in Witcher 2
   Product: Mesa
   Version: 17.2
  Hardware: Other
OS: All
Status: NEW
  Severity: normal
  Priority: medium
 Component: Mesa core
  Assignee: mesa-dev@lists.freedesktop.org
  Reporter: alexan...@tsoy.me
QA Contact: mesa-dev@lists.freedesktop.org

Created attachment 134710
  --> https://bugs.freedesktop.org/attachment.cgi?id=134710=edit
witcher2_glthread.png

Even though there were reports that glthread improves performance in Witcher 2,
and it was enabled via drirc in recent mesa versions, it never worked for me.
"API-thread-offloaded-slots" always stays at zero, see attached screenshot.

In other games like Civilization 5 glthread works on my system as expected.


My current package versions:

linux-4.13.5
mesa-17.2.2
llvm-5.0.0
libdrm-2.4.82
xf86-video-amdgpu-1.4.0

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