[Bug 69828] New: [HSW mobile bisected]smokin-guns performance fluctuate by ~15% with gnome-session

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69828

          Priority: medium
            Bug ID: 69828
          Assignee: chris at chris-wilson.co.uk
           Summary: [HSW mobile bisected]smokin-guns performance fluctuate
                    by ~15% with gnome-session
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mengmeng.meng at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

System Environment:       
----------------------------------------------
Libdrm:    (master)libdrm-2.4.46-42-gbf4a7cd4b2456d4dc93a86bbcc51eba4ae73390a
Mesa:    (master)59157d1c96f33ca56d9aba6cff75145d732dbbab
Xserver:(master)xorg-server-1.14.99.1-215-g7d3d4ae55dd6ee338439e2424a
Xf86_video_intel:(master)2.99.902-47-g63a81c87b1be3607243aaa0acc4cb669fee02b4b
Cairo:    (master)337ab1f8d9e29086bfb4001508b28835b41c6390
Kernel:    (drm-intel-nightly) 532fcf286aa6feba529587d0288a0097ba8b713e

Bug detailed description:
----------------------------------------------
Smoking-guns performances fluctuate by ~15% enabling gnome-session on HSW
mobile GT3e. It works well with Raw X (xinit). BTW, the problem only exists on
HSW mobile.
It’s Xf86_video_intel regression, bisecting show that the first bad commit is:
commit f296872f373d3439b08e055b03584763e6c2ffec
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sun Sep 22 17:29:33 2013 +0100
sna/dri: Fix SwapbufferWait

Performance
--------------------------------------------------------------------
Test smoking-guns enabling gnome-session 
git- 42330fb:  186.90, 179.90, 181.30, 185.70
git- f296872:  177.80, 174.10, 160.30, 174.50

Reproduce steps:
---------------------------------------------
1, xinit&
2, gnome-session&
3, vblank_mode=0  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 +set r_customwidth 1920 +set r_customheight 1080

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