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        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [HSW bisected] cairo-trace(all cases) performance reduce 30%~90%"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=82002">82002</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>chris@chris-wilson.co.uk
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[HSW bisected] cairo-trace(all cases) performance reduce 30%~90%
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>cairo-bugs@cairographics.org
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>major
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>jianx.zhou@intel.com
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>xlib backend
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>cairo
          </td>
        </tr></table>
      <p>
        <div>
        <pre>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 <<a href="mailto:spitzak@gmail.com">spitzak@gmail.com</a>>
AuthorDate: Fri Jul 18 18:46:26 2014 -0700
Commit:     Bryce Harrington <<a href="mailto:b.harrington@samsung.com">b.harrington@samsung.com</a>>
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</pre>
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