[Bug 66297] New: [HSW/IVB bisected] cairo-trace/(benchmark)swfdec-youtube.trace reduced by ~20%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66297

          Priority: medium
            Bug ID: 66297
          Assignee: chris at chris-wilson.co.uk
           Summary: [HSW/IVB bisected]
                    cairo-trace/(benchmark)swfdec-youtube.trace reduced by
                    ~20%
        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:       
----------------------------------------------
Platform:  HSW/IVB
Mesa:        (master)6aabd9490c7b71d363a384935597b3e37295e61e
Xf86_video_intel:   
(master)2.21.9-51-g62e42de300275a668a326357d454062221714fe8
Cairo:        (master)4d9439132de85c0f0f4d5b5a474ea7164910251e
Kernel:    (drm-intel-nightly) 51c5e63195eff27962be315b5c835cdc2fe034fb

Bug detailed description:
----------------------------------------------
cairo-trace/(benchmark)swfdec-youtube.trace reduced by ~20% on IVB/HSW.
It’s Xf86_video_intel regression, bisecting show the first bad commit is that:

commit 48028a7c923fa0d66b01e8e94d4f0742866f78ec
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Jun 21 14:29:43 2013 +0100
    sna: Inspect availablity of render before prefering to use the GPU
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

Performance on IVB
---------------------------------------
                      git-48028a7         git-71fc834
swfdec-youtube.trace     0.385               0.30


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

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