[Bug 87186] New: [BYT]igt/gem_cs_prefetch sporadically takes more than 10 minutes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87186

            Bug ID: 87186
           Summary: [BYT]igt/gem_cs_prefetch sporadically takes more than
                    10 minutes
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 110670
  --> https://bugs.freedesktop.org/attachment.cgi?id=110670&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure

Non-working platforms: BYT

==kernel==
--------------------------
drm-intel-nightly/34d267c2ba9c0845432baf959a2c4deed87f3ee4
drm-intel-fixes/b0616c5306b342ceca07044dbc4f917d95c4f825
drm-intel-next-queued/b05ddd4dfb6303ee9dde359ec913aa7a918fd813

==Bug detailed description==
-----------------------------
It fails 1 in 5 runs on BYT with -nightly kernel.

IGT-Version: 1.8-gf333981 (x86_64) (Linux:
3.18.0_drm-intel-nightly_34d267_20141210_debug+ x86_64)
gem_cs_prefetch: 100%
Test suceeded, cleanup up - this might take a while.

real    13m20.823s
user    0m7.349s
sys     9m17.419s


root at x-bytm02:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./gem_cs_prefetch
IGT-Version: 1.8-gf333981 (x86_64) (Linux:
3.18.0-rc7_drm-intel-next-queued_b05ddd_20141210+ x86_64)
gem_cs_prefetch: 100%
Test suceeded, cleanup up - this might take a while.

real    0m48.062s
user    0m4.316s
sys     0m43.576s

root at x-bytm02:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./gem_cs_prefetch
IGT-Version: 1.8-gf333981 (x86_64) (Linux:
3.18.0-rc7_drm-intel-fixes_b0616c_20141210+ x86_64)
gem_cs_prefetch: 100%
Test suceeded, cleanup up - this might take a while.

real    0m32.991s
user    0m4.115s
sys     0m28.194s

Reproduce steps:
-------------------------
1. ./gem_cs_prefetch

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