[Bug 72023] New: [HSW bisected] cairo-trace/firefox-planet-gnome.trace performance reduce ~35% on Ubuntu

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72023

          Priority: medium
            Bug ID: 72023
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW bisected] cairo-trace/firefox-planet-gnome.trace
                    performance reduce ~35% on Ubuntu
        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: unspecified
         Component: DRM/Intel
           Product: DRI

System Environment:       
----------------------------------------------------------------------
Platform: HSW (OS:Ubuntu)
Libdrm:    (master)libdrm-2.4.49
Mesa:(master)90d185544c897ca0b4c3c677fed4290330bb0706
Xf86_video_intel:(master)2.99.906-28-g12e9
Cairo:    (master)31eff5c6eb57ad379689748fd8c60a5ffe0ba481
Kernel:    (drm-intel-nightly) 164a4cb4c1431a0689f85507868356fae24da638

Bug detailed description:
cairo-trace/firefox-planet-gnome.trace performance reduce ~35% on HSW Ubuntu.
Especially, it works well on HSW Fedora. The problem also doesn’t exist on
IVB(Fedora & Ubuntu).
It’s kernel –dinq regression. By bisected, show that the first bad commit:
commit cbaef0f173c7c8bb14976f3928e5876efec444e2
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Wed Nov 6 23:02:24 2013 +0200
    drm/i915: Set has_fbc=true for all SNB+, except VLV

Performance 
--------------------------------------------
drm-intel-fixes :   1.75
drm-intel-next-queued:2.849
drm-next:1.756 
nightlytop:2.847

Reproduce steps:
--------------------------------------------------------------------
1. xinit&
2. vblank_mode=0 CAIRO_TEST_TARGET=xlib perf/cairo-perf-trace -i 6
/home/cairo-traces/benchmark/firefox-planet-gnome.trace

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