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      <base href="https://bugs.freedesktop.org/" />
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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 --- - [All Regression]igt/gem_fence_upload/thread-contention costs long time to execute sporadically"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=80578">80578</a>
          </td>
        </tr>

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

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

        <tr>
          <th>Summary</th>
          <td>[All Regression]igt/gem_fence_upload/thread-contention costs long time to execute sporadically
          </td>
        </tr>

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

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

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

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

        <tr>
          <th>Reporter</th>
          <td>jinxianx.guo@intel.com
          </td>
        </tr>

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

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

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

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

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=101834" name="attach_101834" title="dmesg">attachment 101834</a> <a href="attachment.cgi?id=101834&action=edit" title="dmesg">[details]</a></span>
dmesg

==System Environment==
--------------------------
Regression: Yes. 

The result was failed before <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [SNB/IVB/HSW/BYT/BDW]igt/gem_fence_upload some subcases fail"
   href="show_bug.cgi?id=80079">Bug 80079</a>

Non-working platforms: All

==kernel==
--------------------------
origin/drm-intel-nightly: 1087d4bf01e79523898c6c31615bf0c369e0039a(fails)
    drm-intel-nightly: 2014y-06m-25d-13h-11m-05s integration manifest
origin/drm-intel-next-queued: 91565c85b66db820f01894a971d39aaef60c4325(fails)
    drm/i915: Don't try to look up object for non-existent fb
origin/drm-intel-fixes: 8525a235c96a548873c6c5644f50df32b31f04c6(fails)
    drm/i915: vlv_prepare_pll is only needed in case of non DSI interfaces

==Bug detailed description==
-----------------------------
igt/gem_fence_upload/thread-contention costs long time to execute sporadically

Output:
root@x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./gem_fence_upload --run-subtest thread-contention
IGT-Version: 1.7-g7ef5372 (x86_64) (Linux:
3.16.0-rc2_drm-intel-nightly_1087d4_20140626+ x86_64)
Contended upload rate for 1 linear threads:     866.974MiB/s
Contended upload rate for 1 tiled threads:      888.099MiB/s
Contended upload rate for 2 linear threads:     587.835MiB/s
Contended upload rate for 2 tiled threads:      513.421MiB/s
Contended upload rate for 4 linear threads:     438.407MiB/s
Contended upload rate for 4 tiled threads:      422.278MiB/s
Contended upload rate for 8 linear threads:       2.486MiB/s
Contended upload rate for 8 tiled threads:        2.449MiB/s
Contended upload rate for 16 linear threads:      2.313MiB/s
Contended upload rate for 16 tiled threads:       2.328MiB/s
Contended upload rate for 32 linear threads:      3.088MiB/s
Contended upload rate for 32 tiled threads:       3.089MiB/s
Contended upload rate for 64 linear threads:      3.837MiB/s
Contended upload rate for 64 tiled threads:       3.838MiB/s
Test assertion failure function thread_contention, file gem_fence_upload.c:321:
Last errno: 0, Success
Failed assertion: linear[1] > 0.75 * linear[0]
Subtest thread-contention: FAIL

real    19m50.070s
user    0m0.142s
sys     78m47.751s

==Reproduce steps==
---------------------------- 
1. ./gem_fence_upload --run-subtest thread-contention</pre>
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