[Bug 101769] 2X performance regression on Mesa 17.1 vs 17.0

[Bug 101769] 2X performance regression on Mesa 17.1 vs 17.0

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https://bugs.freedesktop.org/show_bug.cgi?id=101769

            Bug ID: 101769
           Summary: 2X performance regression on Mesa 17.1 vs 17.0
           Product: Mesa
           Version: 17.1
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: david@lunarg.com
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 132646
  --> https://bugs.freedesktop.org/attachment.cgi?id=132646&action=edit
hack to apitrace for duplicating problem

We have an internal OpenGL benchmarking tool that measures the performance of
certain frames in apitrace files. We have been using this tool to measure
the performance of various releases of Mesa.

We recently found a large regression in Mesa performance of Half Life Episode
2, as measured by our benchmarking tool. We measured the following frame rates
when running the benchmark with Mesa built from the listed source tags:

    tag mesa-17.0.0   358.6 fps
    tag mesa-17.1.3   151.1 fps

This is a reduction in performance of more than 2X.

Since the tool we use to measure performance is an internal tool and we cannot
distribute it, I hacked apitrace to behave similar to our tool so that apitrace
can be used to measure the performance of the problem frame.  The frame rates I
measured with this hacked apitrace benchmark are:

    tag mesa-17.0.0   417.7 fps
    commit 071d80b    393.9 fps
    commit f81ede4    324.6 fps
    tag mesa-17.1.3   196.0 fps

The hacked apitrace shows about the same performance drop between mesa-17.0.0
and mesa-17.1.3 as our original benchmark. I also include the results for
commits 071d80b and f81ede4 because commit f81ede4 seemed to show the single
largest performance drop of all commits between mesa-17.0.0 and mesa-17.1.3.

The configuration of the system I have been using to measure Mesa performance
is:

   CPU: Intel(R) Core(TM) i5-6600K CPU @ 3.50GHz
   RAM: 16Gb
   GPU: AMD RX480

Attached is the patch I applied to apitrace to create my hacked apitrace that
attempts to duplicate the original benchmark.

After building apitrace with the above patch, I used the following command to
measure performance:

    vblank_mode=0 glretrace -b hl2_linux.trace

I can make the hl2_linux.trace trace file available on request. We cannot
widely distribute it because it contains Valve IP (i.e. game images). Please
send a request directly to david@lunarg.com.

Note that we have observed similar performance drops for other games, but I
have concentrated on isolating and reporting on one frame in one game for now.

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[Bug 101769] 2X performance regression on Mesa 17.1 vs 17.0

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https://bugs.freedesktop.org/show_bug.cgi?id=101769

--- Comment #1 from Matias N. Goldberg <dark_sylinc@yahoo.com.ar> ---
I was going to submit a new bug report, but I suspect this is the same issue.

I recently purchased an i7 7700 + Radeon RX 560 2GB to replace my older i5 4650
+ Radeon HD 7770.
But I noticed performance on Dolphin Emulator *went down*. Way down when using
OpenGL; whereas Vulkan has no performance issues and running on Windows gives
similar performance to Linux with Vulkan.

But what's more baffling is the performance with our Ogre 2.1 samples:
1. If I run our Postprocessing sample I can easily obtain 500 fps.
2. But if certain processes are running on the background, such as RenderDoc
with a capture (even if RenderDoc is minimized), the framerate will go down as
low as 55-69fps; with CPU usage around 3% and radeontop indicating a GPU usage
of 15%. This behavior is a little inconsistent, as closing RenderDoc will
increase performance back to 500 fps, but opening RenderDoc again will keep it
at 500 fps. RenderDoc is not the only process to induce this mysterious
behavior, but it is the one I've managed to identify correctly.

At first I suspected a clocking problem, but after setting CPU governor to
performance and echo high >
/sys/class/drm/card0/device/power_dpm_force_performance_level the problem
persisted.

The framerate drops aren't also consistent, another of our samples for example
reduces their performance from 200fps to 40fps.
Dolphin should be performing between 100-200 fps (by comparing with Vulkan and
Windows versions) but it manages between 21-49fps

I will try to see if older versions of Mesa as this ticket suggests will solve
the problem; although I'm not sure if Mesa 17.0.0 supports Polaris.

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[Bug 101769] 2X performance regression on Mesa 17.1 vs 17.0

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https://bugs.freedesktop.org/show_bug.cgi?id=101769

--- Comment #2 from Matias N. Goldberg <dark_sylinc@yahoo.com.ar> ---
Bah, nevermind. Either my bug is not related or it gets fixed the same way.

Updating kernel from 4.11.6 to 4.12.10 seems to have solved all the weird
performance issues.

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[Bug 101769] 2X performance regression on Mesa 17.1 vs 17.0

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https://bugs.freedesktop.org/show_bug.cgi?id=101769

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #3 from Timothy Arceri <t_arceri@yahoo.com.au> ---
Has this performance regression been fixed for you in recent Mesa releases?

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[Bug 101769] 2X performance regression on Mesa 17.1 vs 17.0

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https://bugs.freedesktop.org/show_bug.cgi?id=101769

GitLab Migration User <gitlab-migration@fdo.invalid> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|---                         |MOVED

--- Comment #4 from GitLab Migration User <gitlab-migration@fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/1273.

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