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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 - [BDW]igt/gem_linear_blits/interruptible sporadically takes more than 10 minutes"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=85834">85834</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[BDW]igt/gem_linear_blits/interruptible sporadically takes more than 10 minutes
          </td>
        </tr>

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

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

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

        <tr>
          <th>OS</th>
          <td>Linux (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>huax.lu@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></table>
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        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=108871" name="attach_108871" title="dmesg">attachment 108871</a> <a href="attachment.cgi?id=108871&action=edit" title="dmesg">[details]</a></span>
dmesg

==System Environment==
--------------------------
Regression: not sure 
Non-working platforms: BDW

==kernel==
--------------------------
drm-intel-nightly/203b34bf78a127a85cf89bbd8cf4decd935d780f

==Bug detailed description==
It sporadically takes more than 10 minutes. Run 4 cycles, it happens on the 4th
cycle.

igt/gem_linear_blits/normal also has this issue.

output:
root@x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./gem_linear_blits --run-subtest interruptible
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_782baf_20141104+ x86_64)
not enough RAM to run test, reducing buffer count
Using 3487 1MiB buffers
Verifying initialisation...
Cyclic blits, forward...
Cyclic blits, backward...
Random blits...
Subtest interruptible: SUCCESS (15.324s)

real    0m15.326s
user    0m3.729s
sys     0m5.247s

root@x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./gem_linear_blits --run-subtest interruptible
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_782baf_20141104+ x86_64)
not enough RAM to run test, reducing buffer count
Using 3487 1MiB buffers
Verifying initialisation...
Cyclic blits, forward...
Cyclic blits, backward...
Random blits...

==Reproduce steps==
---------------------------- 
1. time ./gem_linear_blits --run-subtest interruptible</pre>
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