[Bug 78246] New: [IVB/HSW ULT Regression]igt/gem_cs_prefetch costs long time to execute

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78246

          Priority: high
            Bug ID: 78246
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [IVB/HSW ULT Regression]igt/gem_cs_prefetch costs 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 98404
  --> https://bugs.freedesktop.org/attachment.cgi?id=98404&action=edit
dmesg

*System Environment:
--------------------------
Platform: IVB HSW ULT
kernel: 
-nightly: 08ce6614d07dd1e426109672a5e323317c8d6ec7(fails)
-queued: e5c03ca362819ba8ffbe5674340b61b9cd75de8f (fails)
-fixes: 9bbfd20abe5025adbb0ac75160bd2e41158a9e83 (works)


 *Bug detailed description:
-----------------------------
igt/gem_cs_prefetch costs long time to execute, it costs about 11 minutes to
finish.


It's a regression bug
Good commit: bb8786a44c6042ec8a85370466a8bd400a079bdc
Bad commit: e5c03ca362819ba8ffbe5674340b61b9cd75de8f 
We will bisect is later

Output:
date;./gem_cs_prefetch;date
Sun May  4 16:17:43 EDT 2014
IGT-Version: 1.6-gc864279 (x86_64) (Linux:
3.14.0_drm-intel-next-queued_e5c03c_20140504+ x86_64)
gem_cs_prefetch: 100%
Test suceeded, cleanup up - this might take a while.
Sun May  4 16:27:58 EDT 2014

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

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