[cairo-bugs] [Bug 82002] New: [HSW bisected] cairo-trace(all cases) performance reduce 30%~90%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82002

          Priority: medium
            Bug ID: 82002
          Assignee: chris at chris-wilson.co.uk
           Summary: [HSW bisected] cairo-trace(all cases) performance
                    reduce 30%~90%
        QA Contact: cairo-bugs at cairographics.org
          Severity: major
    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: HSW
Libdrm:    (master)libdrm-2.4.56-1-g5d8357976a84396ebe10ed5a0d6ba1b79ccdcf2e
 Mesa:(master)bf3a26266d3f5da18a215c8c11ce75d01582e989
 Xserver:(master)xorg-server-1.15.99.902-121-g2f5cf9ff9a0f713b7e113a5f10a
 Xf86_video_intel:(master)2.99.914-13-ga6a60ec606e291323ee0b6e83679ff277a0bd84a
 Cairo:    (master)f337342c88092a251dc00476c4a9880d1cb90822
 Libva:    (master)3fddb7f937df4e0e15391bd65ae3c7552ea5b3d7
 Libva_intel_driver: (master)82d2ed8d7da3619c0ea467c06604f5626fc0b901
Kernel:drm-intel-nightly git-1be8f2

Bug detailed description:
cairo-trace performance reduce 30%~90% on HSW,
It’s Cairo regression. By bisected, show that the first bad commit:
commit f337342c88092a251dc00476c4a9880d1cb90822
Author:     Bill Spitzak <spitzak at gmail.com>
AuthorDate: Fri Jul 18 18:46:26 2014 -0700
Commit:     Bryce Harrington <b.harrington at samsung.com>
CommitDate: Fri Jul 25 12:16:53 2014 -0700

    V6 image: Use convolution filters for sample reconstruction when
downscaling

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

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