[Bug 97461] FS-UAE waits forever with glClientWaitSync() when using glFenceSync() on amdgpu/radeonsi

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97461

            Bug ID: 97461
           Summary: FS-UAE waits forever with glClientWaitSync() when
                    using glFenceSync() on amdgpu/radeonsi
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: lem.jjr at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 125993
  --> https://bugs.freedesktop.org/attachment.cgi?id=125993&action=edit
apitrace of fs-uae waiting forever after using glFenceSync()

Hi,

In recent mesa-git (during August 2016), there was a change to amdgpu/radeonsi
that has caused FS-UAE (Amiga emulator) to wait forever with glClientWaitSync()
after using glFenceSync(). While it is waiting, it uses 24% CPU but does not
cause the CPU to clock to higher pstates. Using an alternative OpenGL rendering
mode that does not include fences allows FS-UAE to start as expected. This
problem is not present on nVidia, AMDGPU-PRO, nor open source amdgpu as shipped
with Ubuntu 16.04, and has only been a problem during this month (August 2016).

Hardware:
AMD FX-8350
AMD Radeon 380X 4Gb
Asus MG279 27" 2560x1440 144Hz IPS, connected via DisplayPort

Software:
Ubuntu 16.04 AMD64
Padoka PPA
FS-UAE 2.7.14dev2 from https://launchpad.net/~fengestad/+archive/ubuntu/devel


Notable apitrace output on frame number 3 of a waiting instance of fs-uae (from
the attached apitrace file):

1490 @0 glFenceSync(condition = GL_SYNC_GPU_COMMANDS_COMPLETE, flags = 0) =
0x8aba220
1491 @0 glFlush()
1492 @0 glClientWaitSync(sync = 0x8aba220, flags = GL_SYNC_FLUSH_COMMANDS_BIT,
timeout = 0) = GL_TIMEOUT_EXPIRED
1493 @0 glClientWaitSync(sync = 0x8aba220, flags = 0x0, timeout = 0) =
GL_TIMEOUT_EXPIRED
.....
15561 @0 glClientWaitSync(sync = 0x8aba220, flags = 0x0, timeout = 0) =
GL_TIMEOUT_EXPIRED


I suspect this will be related to the fences work that has been committed
recently?

Happy to do more testing. I have also reported the bug in the FS-UAE
development thread here:
http://eab.abime.net/showpost.php?p=1107609&postcount=1146

In case it's helpful at this point:

OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD TONGA (DRM 3.1.0 /
4.4.0-34-lowlatency, LLVM 4.0.0)
OpenGL core profile version string: 4.3 (Core Profile) Mesa 12.1.0-devel -
padoka PPA
OpenGL core profile shading language version string: 4.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 12.1.0-devel - padoka PPA
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL ES profile version string: OpenGL ES 3.1 Mesa 12.1.0-devel - padoka PPA
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.10


Cheers

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