[Bug 89603] New: [SKL]gem_userptr_blits/coherency-sync takes more than 10 minutes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89603

            Bug ID: 89603
           Summary: [SKL]gem_userptr_blits/coherency-sync 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 114374
  --> https://bugs.freedesktop.org/attachment.cgi?id=114374&action=edit
dmesg

==System Environment==
--------------------------
Regression:  not sure, always fails on SKL

no-working platforms: SKL

==kernel==
--------------------------
drm-intel-nightly/4f7ab66fd78ed940a5fcfcaad7e9f1bf8b1abe76
commit 4f7ab66fd78ed940a5fcfcaad7e9f1bf8b1abe76
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Mon Mar 16 18:51:08 2015 +0100

    drm-intel-nightly: 2015y-03m-16d-17h-50m-27s UTC integration manifest


==Bug detailed description==
-----------------------------
It always has this issue on SKL with drm-intel-nightly kernel.
gem_userptr_blits/coherency-unsync also has this issue.

output:
IGT-Version: 1.10-g505645c (x86_64) (Linux:
4.0.0-rc4_drm-intel-nightly_4f7ab6_20150317+ x86_64)
Aperture size is 4096 MiB
Total RAM is 3613 MiB
Not enough RAM to run test, reducing buffer count.
Testing unsynchronized mappings...
Received signal SIGTERM.
Testing synchronized mappings...
Using 2x2709 1MiB buffers
Verifying initialisation...
Cyclic blits cpu->gpu, forward...
Cyclic blits gpu->cpu, backward...
Random blits...
Subtest coherency-sync: SUCCESS (844.768s)
Received signal SIGTERM.

real    14m5.006s
user    0m10.787s
sys     0m58.486s

==Reproduce steps==
---------------------------- 
1.  time ./gem_userptr_blits --run-subtest coherency-sync

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