[Bug 95474] Bioshock Infinite and DiRT Showdown perform very poorly on any GPU with GCN >=1.1

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=95474

--- Comment #5 from Jan Ziak <0xe2.0x9a.0x9b@gmail.com> ---
(In reply to Alex Deucher from comment #2)
> Can you identify what component caused the regression?  mesa?  llvm?  kernel?

Output from "perf report":

# Samples: 660K of event 'cycles'
# Event count (approx.): 568704142352
#
# Overhead  Command        Shared Object      Symbol
     9.94%  G.26           radeonsi_dri.so    [.] pb_cache_is_buffer_compat
     2.51%  G.26           libgcc_s.so.1      [.] __umoddi3
     1.66%  G.26           libc-2.22.so       [.] _int_malloc
     1.52%  G.26           libc-2.22.so       [.] _int_free
     1.42%  G.26           radeonsi_dri.so    [.] radeon_drm_cs_add_buffer
     1.22%  bioshock.i386  radeonsi_dri.so    [.] radeon_cs_context_cleanup
     1.14%  bioshock.i386  [kernel.vmlinux]   [k]
reservation_object_add_shared_fence
     1.02%  G.26           libc-2.22.so       [.] __libc_calloc
     0.93%  G.26           libpthread-2.22.so [.] pthread_mutex_lock
     0.81%  bioshock.i386  [kernel.vmlinux]   [k] __ww_mutex_lock_interruptible
     0.79%  G.26           bioshock.i386      [.] 0x00000000001a8853
     0.79%  G.26           radeonsi_dri.so    [.] pb_cache_reclaim_buffer
     0.78%  G.26           libpthread-2.22.so [.]
__pthread_mutex_unlock_usercnt
     0.74%  G.26           libc-2.22.so       [.] malloc
     0.72%  bioshock.i386  radeonsi_dri.so    [.]
radeon_drm_cs_emit_ioctl_oneshot
     0.66%  bioshock.i386  [radeon]           [k] radeon_bo_list_validate
     0.60%  G.26           radeonsi_dri.so    [.] __x86.get_pc_thunk.bx
     0.56%  G.26           bioshock.i386      [.] 0x00000000001a8e53
     0.56%  G.26           radeonsi_dri.so    [.] set_add
     0.55%  G.26           radeonsi_dri.so    [.] ir_expression::accept
     0.54%  bioshock.i386  [ttm]              [k] ttm_bo_list_ref_sub
     0.54%  G.26           radeonsi_dri.so    [.] _mesa_glsl_parse
     0.53%  G.26           radeonsi_dri.so    [.] radeon_lookup_buffer
     0.52%  G.26           libc-2.22.so       [.] __memcmp_sse4_2
     0.48%  G.26           radeonsi_dri.so    [.] visit_list_elements
     0.47%  bioshock.i386  [kernel.vmlinux]   [k]
reservation_object_reserve_shared
     0.46%  G.26           radeonsi_dri.so    [.] si_reset_buffer_resources
     0.45%  G.26           radeonsi_dri.so    [.] hash_table_search
     0.45%  bioshock.i386  [drm]              [k] drm_gem_object_lookup
     0.42%  G.26           libc-2.22.so       [.] malloc_consolidate
     0.41%  bioshock.i386  [radeon]           [k] radeon_sync_fence
     0.41%  G.26           radeonsi_dri.so    [.] set_search
     0.40%  G.26           radeonsi_dri.so    [.]
u_default_transfer_inline_write
     0.40%  bioshock.i386  [ttm]              [k] ttm_bo_add_to_lru
     0.38%  G.26           radeonsi_dri.so    [.] st_validate_state
     0.36%  bioshock.i386  [ttm]              [k] ttm_bo_del_from_lru

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