[Bug 84501] New: [IVB/BYT/HSW Bisected]Synmark2_DrvCtx performance reduced 50%~80%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84501

          Priority: medium
            Bug ID: 84501
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [IVB/BYT/HSW Bisected]Synmark2_DrvCtx performance
                    reduced 50%~80%
        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 107100
  --> https://bugs.freedesktop.org/attachment.cgi?id=107100&action=edit
dmesg.log

Environment:
-----------------------------------
Platform:IVB/BYT/HSW
Libdrm:(master)libdrm-2.4.58
Mesa:(master)40aabc0e809fa7523606f15c053e0d6ac01d9b9e
Xserver:(master)xorg-server-1.16.0-335-gcc59be38b7eff52a1d003b390f2994c73ee0b3e9
Xf86_video_intel:(master)2.99.916-70-gac492b9af99919d7c579ee4dd636ef6aab90c945
Cairo:(master)fbb0a260b707cb5f02a14cc368c6f2f0d63564c3
Libva:(master)5faa5f50382af6d2f58ba07bbc64d2e9e63abad9
Libva_intel_driver:(master)925c98afcd381e52b37eb3870c3c80ff9c59a069
Kernel:(drm-intel-nightly)7101d84020f63f1da7e0c5d021cdd6be4d515de5

Bug detailed description:
---------------------------------------------
Synmark2_DrvCtx performance reduced 50%~80%on IVB/BYT-M/HSW.
This problem exist both on gnome-session and Raw X.
It's kernel (drm-intel-next-queued)regression,bisect result show first bad
commit is:
commit 1ed26b0b84dab119de93723ad646229db748842d
Author:     Michel Thierry <michel.thierry at intel.com>
AuthorDate: Fri Sep 5 14:13:16 2014 +0100
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Mon Sep 8 09:42:19 2014 +0200

    drm/i915: Enable full PPGTT on gen7

BTW,this issue also exist on drm-intel-nightly branch.
Please see dmesg.log for detail.

Reproduce steps:
---------------------------------------------
1.    xinit&
2.    ./synmark2 OglDrvCtx

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