[cairo-bugs] [Bug 72105] New: [IVB/HSW] ubuntu 13.10 v.s. Fedora19: cairo-traces/ocitysmap.trace reduced by ~60%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72105

          Priority: medium
            Bug ID: 72105
          Assignee: chris at chris-wilson.co.uk
           Summary: [IVB/HSW] ubuntu 13.10 v.s. Fedora19:
                    cairo-traces/ocitysmap.trace reduced by ~60%
        QA Contact: cairo-bugs at cairographics.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jianx.zhou at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: xlib backend
           Product: cairo

System Environment:       
----------------------------------------------------------------------
Platform: IVB/HSW desktop (Ubuntu13.10 v.s Fedora19)
Libdrm:(master)libdrm-2.4.49-2-gc3d96897de647bd5f6d4802c1
Mesa:(master)6b2b4cc8857a9163055c4e9c8007d53a9e668e75
Xf86_video_intel:(master)2.99.906-51-g80d1dee70ba3bdf38
Cairo:(master)31eff5c6eb57ad379689748fd8c60a5ffe0ba481
Libva:(staging)9aa8530ce272dc844428b7273afe7d4f0aaf391d
Libva_intel_driver:(staging)34627c96f331f7a344270c
Kernel:(drm-intel-nightly) 164a4cb4c1431a0689f855

Bug detailed description:
------------------------------------------------------------------------
Ubuntu 13.10 v.s. Fedora19, cairo-trace/ocitysmap.trace reduced by 60% on
IVB/HSW with the same driver. But cairo-traces/xfce4-terminal-a1.trace improved
by ~90% on IVB/HSW.

Ubuntu 13.10 v.s. Fedora 19, there are some subcases also reduced by ~20% only
on HSW.
gnome-system-monitor.trace   -26.39%
gnome-terminal-vim.trace     -24.51%

Reproduce steps:
--------------------------------------------------------------------
1. xinit&
2.vblank_mode=0 CAIRO_TEST_TARGET=xlib perf/cairo-perf-trace -i 12
/home/cairo-traces/benchmark/ocitysmap.trace

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