[Bug 84444] New: [BDW Bisected]Smokin-Guns v1.1 and urbanterror v4.1 performance reduced ~15%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84444

          Priority: medium
            Bug ID: 84444
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW Bisected]Smokin-Guns v1.1 and urbanterror v4.1
                    performance reduced ~15%
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: lilix.cheng at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 107034
  --> https://bugs.freedesktop.org/attachment.cgi?id=107034&action=edit
dmesg.log

Environment:
-----------------------------------
Platform:BDW
Libdrm:(master)libdrm-2.4.56-29-g666788a6062de62aa0b3560760fbb0903167a319
Mesa:(master)5ccdc23a86978628449ace0058cd3697020b0c94
Xserver:(master)xorg-server-1.16.0-335-gcc59be38b7eff52a1d003b
Xf86_video_intel:(master)2.99.916-68-gf785035d5bd42a778d4be0bf3ff8678bd7a7e503
Cairo:(master)fbb0a260b707cb5f02a14cc368c6f2f0d63564c3
Libva:(master)5faa5f50382af6d2f58ba07bbc64d2e9e63abad9
Libva_intel_driver:(master)925c98afcd381e52b37eb3870c3c80ff9c59a069
Kernel:(drm-intel-nightly)7101d84020f63f1da7e0c5d021cdd6be4d515de5

Bug detailed description:
---------------------------------------------
Smokin-Guns v1.1 and urbanterror v4.1 performance reduced ~15% on BDW.This
problem exist both on gnome-session and Raw X,it doesn't exist on
IVB/HSW/BYT-M.
It's kernel (drm-intel-next-queued)regression,bisect result first bad commit
is:
commit d37cf5f7e1b315585940a735a8508d955ffc0f16
Author:     Mika Kuoppala <mika.kuoppala at linux.intel.com>
AuthorDate: Fri Sep 19 20:05:26 2014 +0300
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Wed Sep 24 10:38:41 2014 +0200

    drm/i915/bdw: Cleanup pre prod workarounds

BTW,this issue also exist on drm-intel-nightly branch.

Reproduce steps:
---------------------------------------------
1.    xinit&
2.    vblank_mode=0 ./smokinguns.x86_64 +set r_fullscreen 1 +timedemo 1 +set
demodone "quit" +set demoloop1 "demo pts; set nextdemo vstr demodone" +vstr
demoloop1 +setr_customwidth 1920 +set r_customheight 1080

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