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OpenCL performance on Linux / Radeon VII extremely poor
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Description

System Information
Operating system: Linux-5.3.0-26-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: AMD Radeon VII (VEGA20, DRM 3.33.0, 5.3.0-26-generic, LLVM 9.0.0) X.Org 4.5 (Core Profile) Mesa 19.2.1 <<<<< INCORRECT (amdgpu-pro is installed, and i know blender is using it because it wouldn't even detect the OpenCL device untill amdgpu-pro was installed)

Blender Version
Broken: version: 2.82 (sub 6), branch: master, commit date: 2020-01-27 18:52, hash: rB507a331f0182

OpenCL performance on Radeon VII now seems to be even worse. Takes 3 hours to render a frame that takes 20 minutes on a ryzen 5 3600. GPU fans are all spinning at top speed so I know the GPU is being used.

As additional information, I was only able to install the AMD drivers with this guide/script
https://www.youtube.com/watch?v=97fj4bGJxVM
because I have updated my Ubuntu. I'm not sure if ROCM or dkms is working properly.

Event Timeline

Matthew Wiebe (cerebral_malfunction) created this task.Jan 28 2020, 6:17 PM
Matthew Wiebe (cerebral_malfunction) updated the task description. (Show Details)Jan 28 2020, 7:48 PM
Richard Antalik (ISS) changed the task status from Needs Triage to Needs Information from User.Feb 12 2020, 6:59 PM
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).

@Matthew Wiebe (cerebral_malfunction) Can you give us more information like .blend file to test and which version we sholud use as a baseline for comparison?

Brecht Van Lommel (brecht) added a subscriber: Brecht Van Lommel (brecht).EditedFeb 12 2020, 7:11 PM

Cycles needs to the legacy OpenCL drivers, ROCm will not have good performance.

./amdgpu-install --opencl=legacy --headless
Matthew Wiebe (cerebral_malfunction) added a comment.Feb 14 2020, 4:44 PM

finally bit the bullet and downgraded to 18.04 to use the exact official drivers
but apparently it STILL won't install on this kernel

after running

./amdgpu-install --opencl=legacy --headless

i get

Error! Bad return status for module build on kernel: 5.3.0-28-generic (x86_64)
Consult /var/lib/dkms/amdgpu/19.50-967956/build/make.log for more information.
Setting up amdgpu-pro-core (19.50-967956) ...
Setting up libdrm-amdgpu-amdgpu1:amd64 (1:2.4.99-967956) ...
Setting up libopencl1-amdgpu-pro:amd64 (19.50-967956) ...
Setting up opencl-orca-amdgpu-pro-icd:amd64 (19.50-967956) ...
Setting up clinfo-amdgpu-pro (19.50-967956) ...
Processing triggers for libc-bin (2.27-3ubuntu1) ...
WARNING: amdgpu dkms failed for running kernel
Brecht Van Lommel (brecht) closed this task as Archived.Feb 14 2020, 5:27 PM
Brecht Van Lommel (brecht) claimed this task.

The 19.50 amdgpu-pro drivers work for me on Ubuntu 18.04.4, but this is with Linux kernel version 4.15.0.

Maybe the amdgpu-pro drivers are incompatible kernel version 5.3? I'm not sure, I can't immediately find information about it. On the download page it say they are for Ubuntu 18.04.2.

There are many reports about similar issues with the amdgpu-pro drivers online. But this is not something we can fix on the Blender side, besides getting ROCm officially supported and working through any issues with that. But that's a bigger project, outside the scope of the bug tracker.

Matthew Wiebe (cerebral_malfunction) added a comment.Feb 14 2020, 9:21 PM

understood :( where else can i voice my support for such a project? openCL feels so fragile right now.....

Brecht Van Lommel (brecht) added a comment.Feb 17 2020, 12:15 PM

Here are some places:
https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests