[Bug 97260] [bisected] R9 290 low performance in Linux 4.7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97260

Kai <kai at dev.carbon-project.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |bisected
                 CC|                            |michel at 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 at 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 at 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 at amd.com>
    Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher at 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.

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