Comment # 1
on bug 101769
from Matias N. Goldberg
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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