| Bug ID | 101182 |
|---|---|
| Summary | Reading amdgpu_pm_info causes stutter with Linux 4.12-rc |
| Product | DRI |
| Version | DRI git |
| Hardware | Other |
| OS | All |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | DRM/AMDgpu |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | haagch@frickel.club |
A stutter once wouldn't be so bad, but apps like radeon-profile repeatedly read this file, so rendering stutters constantly. You will have a hard time spotting it in the average fps graph, but with my (still very inaccurate) low-fps patch at https://github.com/ChristophHaag/mesa-mesa/commit/e097b91a85c85718576589402e075e7f5668e68c it's very visible that there is at least one frame that's delayed a lot each time amdgpu_pm_info is read. The GPU load does give an independent hint that something is wrong though. To reproduce: run glxgears run sudo watch --interval=.3 cat /sys/kernel/debug/dri/0/amdgpu_pm_info observe stuttering in glxgears. RX 480, Linux 4.12-rc2. I haven't tested 4.11 to confirm, but if I remember correctly, this happens in mainline since 4.12.
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