[Bug 795195] New: gst_vaapi_texture_glx_put_surface_unlocked is blocked 75-80% of the time

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795195

            Bug ID: 795195
           Summary: gst_vaapi_texture_glx_put_surface_unlocked is blocked
                    75-80% of the time
    Classification: Platform
           Product: GStreamer
           Version: 1.14.0
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: daniel.van.vugt at canonical.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

gst_vaapi_texture_glx_put_surface_unlocked is blocked 75-80% of the time.

This means if you need more than 20-25% CPU to decode and render a video,
you're going to miss frames.

I noticed this with two different machines. While they both spend around 75% of
their (real) time blocked in gst_vaapi_texture_glx_put_surface_unlocked, only
the one with the lower CPU requirement (10%) was able to render the video
smoothly. The other machine which requires 40% CPU time to play the same video
stutters badly, probably because 40%+75% > 100%.

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