[Bug 79715] New: [IVB/HSW/BYT-M/BDW Bisected]Warsow1.0/Xonotic 0.7/GpuTest_v0.5_triangle_fullscreen performance reduced by 20%~60%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79715

          Priority: medium
            Bug ID: 79715
          Assignee: chris at chris-wilson.co.uk
           Summary: [IVB/HSW/BYT-M/BDW Bisected]Warsow1.0/Xonotic
                    0.7/GpuTest_v0.5_triangle_fullscreen performance
                    reduced by 20%~60%
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jianx.zhou at intel.com
          Hardware: All
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Platform: IVB/HSW/BYT-M/BDW
Libdrm: (master)libdrm-2.4.54-9-g8fc62ca8ac010659023bb63c4759eb683de4f9af
Mesa: (master)cf29913aa156accbe60cb35f9a0bd2c21726cfa3
Xserver: (master)xorg-server-1.15.99.903
Xf86_video_intel:
(master)2.99.911-256-g08148896196443a8582c30b47ff546acca78d69c
Cairo: (master)ead5c7909f3db1d0d81121fc2775c458871891b2
Libva: (staging)35e70cb9b9c77dfb99fb370e319ed501f0c31b17
Libva_intel_driver: (staging)fbbe401aa28a0b3859d587ef08f0df15a2f7c8f2
Kernel:(drm-intel-nightly)git-0a37b5

Bug detailed description:
----------------------------------------------
Warsow1.0,Xonotic 0.7,GpuTest_v0.5_triangle_fullscreen,Counter-Strike
Source,Half-Life 2 performance reduced by 20%~60% on IVB/HSW/BYT-M/BDW. The
problem exists on gnome-session and Raw X. It’s  Xserver regression.
By bisected show the first bad commit is :
e6f5d9d7b7efdacea0f22f1808efca849bcede4c
Author:     Keith Packard <keithp at keithp.com>
AuthorDate: Mon Jan 27 11:23:58 2014 -0800
Commit:     Keith Packard <keithp at keithp.com>
CommitDate: Wed Jun 4 22:03:35 2014 -0700
    present: Queue flips for later execution


Reproduce steps:
---------------------------------------------
1. xinit&
vblank_mode=0 ./warsow.x86_64 +set vid_fullscreen 1 +logconsole pts-log exec
rofiles/high+.cfg +timedemo 1 +cg_showFPS 1 +cl_maxfps 999 +cl_checkForUpdate 0
+demo pts-demo10 +next quit +r_mode -1 +vid_customwidth 1920 +vid_customheight
1080 +vid_restart

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