https://bugs.freedesktop.org/show_bug.cgi?id=97260
Kai kai@dev.carbon-project.org changed:
What |Removed |Added ---------------------------------------------------------------------------- Keywords| |bisected CC| |michel@daenzer.net Summary|R9 290 low performance in |[bisected] R9 290 low |Linux 4.7 |performance in Linux 4.7
--- Comment #12 from Kai kai@dev.carbon-project.org --- Ok, after 14 steps of bisection I identified the first bad commit as:
c63dd758589b1f7e8398841d1f443f06ebfbcefc is the first bad commit commit c63dd758589b1f7e8398841d1f443f06ebfbcefc Author: Michel Dänzer michel.daenzer@amd.com Date: Fri Apr 1 18:51:34 2016 +0900
drm/radeon: Support DRM_MODE_PAGE_FLIP_ASYNC
When this flag is set, we program the hardware to execute the flip during horizontal blank (i.e. for the next scanline) instead of during vertical blank (i.e. for the next frame).
Currently this is only supported on ASICs which have a page flip completion interrupt (>= R600), and only if the use_pflipirq parameter has value 2 (the default).
Reviewed-by: Christian König christian.koenig@amd.com Signed-off-by: Michel Dänzer michel.daenzer@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com
:040000 040000 2f3d8295e7fa2809a3546a23c64da33311e624b9 6cd9fd9b53df0942efab559295e4c11fc6cc0463 M drivers
An additional build of 4.7.0 with c63dd758589b1f7e8398841d1f443f06ebfbcefc reverted maintains the performance level of 4.6.x.
Adding Michel to the CC list of this bug, since he authored the offending commit. Let me know, if you need anything else.