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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [BXT]15% performance drop in SynMark v7.0 Multithread use-case"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=102334">102334</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[BXT]15% performance drop in SynMark v7.0 Multithread use-case
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>DRI git
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>DRM/Intel
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>eero.t.tamminen@intel.com
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>i915 platform</th>
          <td>BXT
          </td>
        </tr></table>
      <p>
        <div>
        <pre>drm-tip kernel has caused ~15% drop in SynMark v7.0 Multithread 3D use-case
between these commits:

kernel git://anongit.freedesktop.org/drm-tip at
560582ef03d1f6bf9010232fcc6613188a00d198 2017-07-17_16-27-42 drm-tip:
2017y-07m-17d-16h-27m-16s UTC integration manifest

kernel git://anongit.freedesktop.org/drm-tip at
10de1e17faaab452782e5a1baffd1b30a639a261 2017-07-18_10-09-14 drm-tip:
2017y-07m-18d-10h-08m-42s UTC integration manifest

(This test has quite a large variance, but 15% drop in this period is very
clear from the longer term trend.)

This drop is BXT specific and visible on 2 different BXT (18 EU) J4205 devices.

Multithread test has 4 work threads doing low and hi resolution reflections /
environment map rendering, with main thread rendering the final HDR image with
tone mapping and bloom.  This requires enough draw calls & syching that this
test is (mostly) CPU bound.

Note: The less CPU bound version (HdrBloom) of this test, which has only 1 work
thread instead of 4, and which uses higher resolution & details for that,
doesn't show any (clear) performance regression.</pre>
        </div>
      </p>


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