[Bug 81832] New: [BDW Regression]igt/gem_userptr_blits/swapping-normal-sync cases long time to execute

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81832

          Priority: high
            Bug ID: 81832
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW
                    Regression]igt/gem_userptr_blits/swapping-normal-sync
                    cases long time to execute
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 103580
  --> https://bugs.freedesktop.org/attachment.cgi?id=103580&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. 
Good commit on -next-queued: 33688d95c458ffca6b247189cc6f15277fd6abf0(the
result was skipped)

Non-working platforms: BDW

==kernel==
--------------------------
origin/drm-intel-nightly: e967a525207bd40ab446e2f809907039f88e66f3(fails)
    drm-intel-nightly: 2014y-07m-25d-23h-02m-06s integration manifest
origin/drm-intel-next-queued: eff9b57c1a91ccf309d57500ab6a365ba7be5712(fails)
    drm/i915: Update DRIVER_DATE to 20140725
origin/drm-intel-fixes: f4be89cecea437aaddd7700d05c6bdb5678041f7(fails)
    drm/i915: Fix crash when failing to parse MIPI VBT

==Bug detailed description==
igt/gem_userptr_blits/swapping-normal-sync cases long time to execute

Output:
[root at x-bdw01 tests]# time ./gem_userptr_blits --run-subtest
swapping-normal-sync
IGT-Version: 1.7-gfcbc502 (x86_64) (Linux:
3.16.0-rc6_drm-intel-nightly_e967a5_20140727+ x86_64)
Aperture size is 4096 MiB
Total RAM is 3867 MiB
Testing unsynchronized mappings...
Testing synchronized mappings...

Subtest swapping-normal-sync: SUCCESS

real    17m54.142s
user    0m0.433s
sys     9m40.832

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

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