[Bug 95380] [BAT various] basic-flip-vs-wf_vblank fails with unexpected frame count

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95380

--- Comment #6 from Luis Botello <luis.botello.ortega at intel.com> ---
I also have tested over APL and i got the following results:

 |=== Software information ===|

 ++ Kernel version                      :
4.6.0-drm-intel-nightly-ww21-commit-2ec8239+
 ++ Linux distribution                  : Ubuntu 16.04 LTS
 ++ Architecture                        : 64-bit
 ++ xf86-video-intel version            : 2.99.917
 ++ Xorg-Xserver version                : 1.18.99.1
 ++ DRM version                         : 2.4.68
 ++ VAAPI version                       : Intel i965 driver for Intel(R)
Broxton - 1.7.1.pre1 (1.7.0-23-g0be0b21)
 ++ Cairo version                       : 1.15.2
 ++ Kernel driver in use                : i915


 |=== Hardware information ===|

 ++ Platform                            : BXT-P
 ++ Motherboard model                   : Broxton P
 ++ Motherboard type                    : NOTEBOOK Hand Held
 ++ Motherboard manufacturer            : Intel Corp.
 ++ CPU family                          : Other
 ++ CPU information                     : 06/5c
 ++ GPU Card                            : Intel Corporation Device 5a84 (rev
0a) (prog-if 00 [VGA controller])

=========================================================================


bad commit :

commit b88bce40a25d2393a51298f0d699e66491975cc9
Author: Mika Kuoppala <mika.kuoppala at intel.com>
Date:   Fri May 13 16:53:57 2016 +0300

    tests/gem_evict_everything: use uint64_t in subtest params

    Use large enough datatype so that we get the accurate
    mem requirements and thus skips on 48bit ppgtt.

    References: https://bugs.freedesktop.org/show_bug.cgi?id=94146
    Acked-by: Chris Wilson <chris at chris-wilson.co.uk>
    Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>

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good commit : 

commit 5cc3175ca5a0374c17bd201ba5a35ef4ff076003
Author: Feceoru, Gabriel <gabriel.feceoru at intel.com>
Date:   Fri May 13 14:45:09 2016 +0300

    tests/kms_flip: Adjust tolerance when counting frames

    basic-flip-vs-wf_vblank subtest sometimes fails asserting counted frames to
    be aproximately equal with the estimated number.

    This is a false negative, one of the reasons being the precision lost when
    truncating a fractional number.

    Fixed this by using floating point arithmetic.

    Cc: Jani Nikula <jani.nikula at intel.com>
    Cc: Daniel Vetter <daniel.vetter at intel.com>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95380 [mvlad]
    Signed-off-by: Gabriel Feceoru <gabriel.feceoru at intel.com>
    Signed-off-by: Marius Vlad <marius.c.vlad at intel.com>

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good commit:

commit 9579e5447aa304d0b8d36688b8d0da0c97ca284a
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon May 23 21:56:01 2016 +0100

    test: Add legacy cursor stress test

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

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