[Bug 793339] New: kmssink: Renders at half my display refresh rate

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793339

            Bug ID: 793339
           Summary: kmssink: Renders at half my display refresh rate
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

While doing some latency test, I notice that kmssink renders at half the speed
of my display. My test pipeline was:

gst-launch-1.0 -v videotestsrc ! video/x-raw,framerate=60/1 ! fpsdisplaysink
text-overlay=0 video-sink=kmssink

Commenting out the code that (according to comment) tries to wait for previous
frame to finish fixes it.

https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/sys/kms/gstkmssink.c#n1499

My impression is that we endup waiting for an extra vblank all the time as the
previous blank is behind.

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