[Bug 86891] AMD/ATI Tahiti XT 7970 - long lags/stutters in games

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=86891

--- Comment #3 from Michael Mair-Keimberger <bu9zilla at gmail.com> ---
I though it takes more time, but i already finished bisecting :)

The result:

59bc1d89d6a4d67c94a9b70fa81bda1d5b04f0cb is the first bad commit
commit 59bc1d89d6a4d67c94a9b70fa81bda1d5b04f0cb
Author: Lauri Kasanen <cand at gmx.com>
Date:   Sun Apr 20 20:29:33 2014 +0300

    drm/radeon: Inline r100_mm_rreg, -wreg, v3

    This was originally un-inlined by Andi Kleen in 2011 citing size concerns.
    Indeed, a first attempt at inlining it grew radeon.ko by 7%.

    However, 2% of cpu is spent in this function. Simply inlining it gave 1%
more fps
    in Urban Terror.

    v2: We know the minimum MMIO size. Adding it to the if allows the compiler
to
    optimize the branch out, improving both performance and size.

    The v2 patch decreases radeon.ko size by 2%. I didn't re-benchmark, but
common sense
    says perf is now more than 1% better.

    v3: Also change _wreg, make the threshold a define.

    Inlining _wreg increased the size a bit compared to v2, so now radeon.ko
    is only 1% smaller.

    Signed-off-by: Lauri Kasanen <cand at gmx.com>
    Reviewed-by: Christian König <christian.koenig at amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

:040000 040000 91cde817761a93a06d21855ec896d22f03685665
e7de121e74c415308e8266c26ae7ad518d0e8530 M      drivers

This is the bad commit.


asterix linux # git bisect log
git bisect start
# bad: [7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9] Linux 3.17-rc1
git bisect bad 7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9
# good: [64aa90f26c06e1cb2aacfb98a7d0eccfbd6c1a91] Linux 3.16-rc7
git bisect good 64aa90f26c06e1cb2aacfb98a7d0eccfbd6c1a91
# good: [ae045e2455429c418a418a3376301a9e5753a0a8] Merge
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
git bisect good ae045e2455429c418a418a3376301a9e5753a0a8                        
# bad: [44c916d58b9ef1f2c4aec2def57fa8289c716a60] Merge tag 'cleanup-for-3.17'
of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc                    
git bisect bad 44c916d58b9ef1f2c4aec2def57fa8289c716a60                         
# good: [e669830526a0abaf301bf408df69cde33901ac63] Merge branch 'upstream' of
git://git.linux-mips.org/pub/scm/ralf/upstream-linus                            
git bisect good e669830526a0abaf301bf408df69cde33901ac63                        
# bad: [7963e9db1b1f842fdc53309baa8714d38e9f5681] Revert "drm: drop redundant
drm_file->is_master"                                                            
git bisect bad 7963e9db1b1f842fdc53309baa8714d38e9f5681                         
# good: [8a105aaa25f4504d26ca828f12d709d2213a230e] Merge branch
'drm-armada-devel' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into drm-next   
git bisect good 8a105aaa25f4504d26ca828f12d709d2213a230e                        
# good: [a2fe6cdc03d7a9b0d048a7f32f9d8827e06c67fa] drm/msm/hdmi: fix
HDMI_MUX_EN gpio request typo                                                   
git bisect good a2fe6cdc03d7a9b0d048a7f32f9d8827e06c67fa                        
# bad: [e7e31600d3e2f8b7726b0521149fc55c62a90467] drm/radeon: remove taking
mclk_lock from radeon_bo_unref                                                  
git bisect bad e7e31600d3e2f8b7726b0521149fc55c62a90467                         
# bad: [c748990b7b1c320c626c758379d50748588c6ed6] drm/radeon: Use correct value
for unknown audio/video latency                                                 
git bisect bad c748990b7b1c320c626c758379d50748588c6ed6                         
# good: [96b1b9711031a1e95e3cf15d830802aed38479a6] Merge branch
'drm_kms_for_next-v8' of git://git.linaro.org/people/benjamin.gaignard/kernel
into drm-next                                                                   
git bisect good 96b1b9711031a1e95e3cf15d830802aed38479a6                        
# good: [636e2582658742b94e7620becce58f939996c961] drm/radeon/dpm: add support
for SVI2 voltage for SI                                                         
git bisect good 636e2582658742b94e7620becce58f939996c961                        
# good: [f2c6b0f452c3804496f55655fda28c2809e1a58b] drm/radeon/cik: Add support
for new ucode format (v5)                                                       
git bisect good f2c6b0f452c3804496f55655fda28c2809e1a58b                        
# good: [da9976206c15178eeae1b4445c9266125bf35b0a] drm/radeon: enable display
scaling on all connectors (v2)                                                  
git bisect good da9976206c15178eeae1b4445c9266125bf35b0a                        
# bad: [59bc1d89d6a4d67c94a9b70fa81bda1d5b04f0cb] drm/radeon: Inline
r100_mm_rreg, -wreg, v3                                                         
git bisect bad 59bc1d89d6a4d67c94a9b70fa81bda1d5b04f0cb                         
# good: [3e22920fbd0005927bc41f71daeb056a0f4def82] drm/radeon: consolidate vga
and dvi get_modes functions (v2)                                                
git bisect good 3e22920fbd0005927bc41f71daeb056a0f4def82                        
# first bad commit: [59bc1d89d6a4d67c94a9b70fa81bda1d5b04f0cb] drm/radeon:
Inline r100_mm_rreg, -wreg, v3

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