[Bug 78931] New: [BDW]igt/gem_ringfill/render costs long time to execute

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78931

          Priority: medium
            Bug ID: 78931
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW]igt/gem_ringfill/render 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 99368
  --> https://bugs.freedesktop.org/attachment.cgi?id=99368&action=edit
dmesg

==System Environment==
--------------------------
Regression: No. 
This case always timeout

Non-working platforms: BDW

==kernel==
--------------------------
-nightly: f79ba79cf037eea9ee757ad37730b00f43d5ef80 (works)
-queued: d3b448d9917a3d6531e499d88bfb13ea5e31e4ad (works)
    Author: Chris Wilson <chris at chris-wilson.co.uk>
    Date:   Fri May 16 18:59:00 2014 +0100

    drm/i915: Only unpin the default ctx object if it exists

    Since commit 691e6415c891b8b2b082a120b896b443531c4d45
    Author: Chris Wilson <chris at chris-wilson.co.uk>
    Date:   Wed Apr 9 09:07:36 2014 +0100

        drm/i915: Always use kref tracking for all contexts.

    we have contexts everywhere, and so we must be careful to distinguish
    fake contexts, which do not have an associated bo, and real ones, which
    do. In particular, we now need to be careful not to dereference NULL
    pointers.

    This is one such example, as the commit highlighted above failed to move
    the unpinning of the default ctx object into the real-context-only
    branch.

    Reported-by: Daniel Vetter <daniel.vetter at ffwll.ch>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78792
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
    Cc: Ben Widawsky <benjamin.widawsky at intel.com>
    Cc: Mika Kuoppala <mika.kuoppala at intel.com>
    Cc: Jani Nikula <jani.nikula at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

-fixes: e95a2f7509f5219177d6821a0a8754f93892ca56 (fails)
    Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Date:   Thu May 8 15:09:19 2014 +0300

    drm/i915: Increase WM memory latency values on SNB

    On SNB the BIOS provided WM memory latency values seem insufficient to
    handle high resolution displays.

    In this particular case the display mode was a 2560x1440 at 60Hz, which
    makes the pixel clock 241.5 MHz. It was empirically found that a memory
    latency value if 1.2 usec is enough to avoid underruns, whereas the BIOS
    provided value of 0.7 usec was clearly too low. Incidentally 1.2 usec
    is what the typical BIOS provided values are on IVB systems.

    Increase the WM memory latency values to at least 1.2 usec on SNB.
    Hopefully this won't have a significant effect on power consumption.

    v2: Increase the latency values regardless of the pixel clock

    Cc: Robert N <crshman at gmail.com>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=70254
    Tested-by: Robert Navarro <crshman at gmail.com>
    Tested-by: Vitaly Minko <vitaly.minko at gmail.com>
    Cc: stable at vger.kernel.org
    Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Signed-off-by: Jani Nikula <jani.nikula at intel.com>

==Bug detailed description==
-----------------------------
igt/gem_ringfill/render costs long time to execute

This bug only occurs on -fixes branch

Output:
time ./gem_ringfill --run-subtest render
IGT-Version: 1.6-gd71add5 (x86_64) (Linux:
3.15.0-rc3_drm-intel-fixes_e95a2f_20140519+ x86_64)
filling render ring: 100%
verifying
Subtest render: SUCCESS

real    12m18.205s
user    0m3.247s
sys     0m23.337s


==Reproduce steps==
---------------------------- 
1. ./gem_ringfill --run-subtest render

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