[cairo-bugs] [Bug 87438] New: [IVB/BDW Bisected] Firefox-fishbowl.trace and Firefox-fishtank.trace performance reduced ~96%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87438

            Bug ID: 87438
           Summary: [IVB/BDW Bisected] Firefox-fishbowl.trace and
                    Firefox-fishtank.trace performance reduced ~96%
           Product: cairo
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: xlib backend
          Assignee: chris at chris-wilson.co.uk
          Reporter: wendy.wang at intel.com
        QA Contact: cairo-bugs at cairographics.org

Created attachment 110981
  --> https://bugs.freedesktop.org/attachment.cgi?id=110981&action=edit
dmesg file

Environment:
-----------------------------------
Test Platform:IVB/BDW

GFX SW Stack
Libdrm:                        
(master)libdrm-2.4.58-19-gf99522e678dbbaffeca9462a8edcbe900574dc12
Mesa:                          
(master)83e8bb5b1a50c0105b642d559999f07fa64a982f
Xserver:                      
(master)xorg-server-1.16.99.901-98-g0f5fdaf600bfeada966aea942cb3e347d4efee30
Xf86_video_intel:                       
(master)2.99.916-177-g99537089346ed7a1bc6b02349fad93845e865bb9
Cairo:                           
(master)4a225fca5f121c31ddaa0af80a13bf95a7f21a5b
Libva:                           
(master)8986ec692b19d8dd6bd2aa118b5dffbd05a8f909
Libva_intel_driver:                     
(master)b5d6d9d425a6d539b27d22992bda05f79d1a0622
Kernel:   (drm-intel-nightly)8b7ac3dc495c2d02322bc751322331d2691089e5

Regression:
-----------------------------------
YES


Bug detailed description:
---------------------------------------------
Firefox-fishbowl.trace and Firefox-fishtank.trace performance reduced ~96%.
It's Cairo regression, from bisect result, first bad commit is:

58728da6eba4d89ba7c4328b22a552af633abb05

Author: Bill Spitzak <spitzak at gmail.com>
Date:   Thu Oct 9 19:46:13 2014 -0700

    xlib: Use image fallback for GOOD/BEST filters

    Fallback is not used if the symbols defined in the previous patch to
    indicate if XRender does GOOD/BEST are true.

    This patch also includes some changes to take advantage of the fact that
    if there is an integer translation analyze_filter will already have set
    the filter to NEAREST.

    Reviewed-by: Bryce Harrington <b.harrington at samsung.com


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

dmesg and xorg.log files have been uploaded.

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