[Bug 88308] New: [IVB/BYT Bisected]igt/gem_exec_big causes more than 10 minutes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88308

            Bug ID: 88308
           Summary: [IVB/BYT Bisected]igt/gem_exec_big causes more than 10
                    minutes
           Product: DRI
           Version: unspecified
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: high
         Component: DRM/Intel
          Assignee: chris at chris-wilson.co.uk
          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 112106
  --> https://bugs.freedesktop.org/attachment.cgi?id=112106&action=edit
dmesg

==System Environment==
--------------------------
Regression: yes

Non-working platforms: IVB/BYT

==kernel==
--------------------------
drm-intel-nightly/1113d085dfdba11c64772bfb4da26d1d3a163512
commit 1113d085dfdba11c64772bfb4da26d1d3a163512
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Fri Jan 9 11:07:32 2015 +0100

    drm-intel-nightly: 2015y-01m-09d-10h-07m-04s UTC integration manifest

==Bug detailed description==
-----------------------------
It takes more than 10 minutes. It's igt regression.
Bisect shows: 1dddf32df97f1f1c5269d1bc3ece1d6183277603 is the first bad commit.
commit 1dddf32df97f1f1c5269d1bc3ece1d6183277603
Author:     Chris Wilson <chris at chris-wilson.co.uk>
AuthorDate: Tue Nov 18 09:45:56 2014 +0000
Commit:     Chris Wilson <chris at chris-wilson.co.uk>
CommitDate: Fri Jan 9 12:24:40 2015 +0000

    igt/gem_exec_big: Increase stress

    We should be able to execute batches up to the full GTT size (give or
    take fragmentation), so let's try!

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

output:
IGT-Version: 1.9-g1dddf32 (x86_64) (Linux:
3.19.0-rc3_drm-intel-nightly_1113d0_20150111_debug+ x86_64)
^C
real    16m23.628s
user    0m0.317s
sys     16m17.387s

==Reproduce steps==
---------------------------- 
1. ./gem_exec_big

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