Created attachment 125811 [details] dmesg 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Polaris10] (rev c7) Tried on vanilla Linux 4.7 and 4.8-rc2 with the async pageflip commit reverted. I'm testing with a very simple directx9 application (without nine) because the impact is extremely obvious with wine: http://www.codesampler.com/dx9src/dx9src_1.htm#dx9_initialization Before suspending it runs with 5000+ FPS, after suspending it runs with <1000. Also, if you keep the mouse pointer over the window moving, it will have a very small performance drop before suspending and a huuuge performance drop after suspending. I looked at the powerplay values in sysfs while that application is running in wine and before suspend, pcie is 0: 2.5GB, x8 1: 8.0GB, x16 * and sclk is 0: 300Mhz 1: 608Mhz 2: 910Mhz 3: 1077Mhz 4: 1145Mhz 5: 1191Mhz 6: 1236Mhz 7: 1288Mhz * after suspend it's pcie 0: 2.5GB, x8 * 1: 8.0GB, x16 and sclk 0: 300Mhz 1: 608Mhz * 2: 910Mhz 3: 1077Mhz 4: 1145Mhz 5: 1191Mhz 6: 1236Mhz 7: 1288Mhz mclk is 0: 300Mhz 1: 2000Mhz * in both cases. I then tried echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level and the sclk clock goes to max and pcie goes to 16x again, but the performance of the application does NOT increase so it looks like the low clocks are a symptom of whatever causes low performance. dmesg from 4.8-rc2 attached, shows some errors: [ 574.369317] failed to send message 5e ret is 0 [ 574.369317] [drm:amdgpu_vce_ring_test_ring [amdgpu]] *ERROR* amdgpu: ring 12 test failed [ 574.369317] [drm:amdgpu_resume [amdgpu]] *ERROR* resume of IP block <vce_v3_0> failed -110 [ 574.369317] [drm:amdgpu_resume_kms [amdgpu]] *ERROR* amdgpu_resume failed (-110).
Created attachment 125857 [details] dmesg drm-next-4.9-wip Just tried with drm-next-4.9-wip. The vce error message is gone but the performance issue remains. So I can at least say that this error was unrelated.
I can confirm, I also see this. The performance reduction also depends on the application for me. I think this issue has existed from the very start, so there's no point in trying to bisect.
FWIW, the Metro 2033 games experience a particularly bad reduction in performance after suspend. Basically half FPS. Other demanding games, e.g. Tomb Raider, are not affected quite as much. Still no idea what could be causing this.
The issue is still present. After resume, I can make GPU to max MHz, but the memory stays at 300MHz. Ubuntu 16.04 + kernek 4.10rc7 + oibaf ppa (mesa git)
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