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GL: using vaapi and showing on glimagesink on wayland loads one core for 100% on 1.16

Using this pipeline

XDG_RUNTIME_DIR=/run/user/1002 gst-launch-1.0 filesrc location=file.mkv ! matroskademux ! "video/x-h264" ! queue ! vaapih264dec ! vaapipostproc ! glimagesink -v

On 1.14, the load is around a couple 6% on a single core, when using 1.16, this is 100% (full HD).

perf top on the process shows (on 1.16)

  29.61%  [kernel]                      [k] __indirect_thunk_end
  19.57%  [kernel]                      [k] __stop___bug_table+0xabecbe
  11.30%  [unknown]                     [k] 0xfffffe000003201b
   3.86%  [kernel]                      [k] __start___jump_table+0xa0bd60
   3.48%  libglib-2.0.so.0.5800.3       [.] g_mutex_unlock
   3.30%  libglib-2.0.so.0.5800.3       [.] g_mutex_lock
   1.64%  [kernel]                      [k] descriptor.55996+0xa02020
   1.52%  [unknown]                     [k] 0xfffffe000003201e
   1.40%  libpthread-2.28.so            [.] __libc_write
   1.33%  libpthread-2.28.so            [.] __pthread_enable_asynccancel
   1.32%  libpthread-2.28.so            [.] __pthread_mutex_lock
   1.26%  [unknown]                     [k] 0xfffffe0000032025
   1.20%  libpthread-2.28.so            [.] __pthread_mutex_unlock_usercnt
   1.15%  libpthread-2.28.so            [.] __pthread_disable_asynccancel
   1.07%  libglib-2.0.so.0.5800.3       [.] g_main_context_check
   1.06%  [kernel]                      [k] descriptor.56037+0xa02028
   0.86%  libpthread-2.28.so            [.] __libc_recvmsg
   0.82%  libc-2.28.so                  [.] __poll
   0.81%  [unknown]                     [k] 0xfffffe000003200c
   0.80%  [kernel]                      [k] descriptor.48124+0xa02003
   0.76%  libpthread-2.28.so            [.] __libc_read
   0.71%  [kernel]                      [k] orc_lookup+0xa02548
   0.69%  [kernel]                      [k] ioctl_pointer+0xa021a5
   0.49%  libglib-2.0.so.0.5800.3       [.] g_main_context_dispatch
   0.47%  libglib-2.0.so.0.5800.3       [.] g_slice_free1
   0.41%  [kernel]                      [k] descriptor.48130+0xa02014
   0.35%  [kernel]                      [k] event_exit__msgget+0xa0207a
   0.34%  libglib-2.0.so.0.5800.3       [.] g_main_context_prepare
   0.32%  [kernel]                      [k] init_ipc_ns+0xa021a2
   0.29%  [kernel]                      [k] descriptor.22848+0xa02010
   0.25%  [kernel]                      [k] descriptor.69342+0xa02013
   0.23%  libc-2.28.so                  [.] 0x0000000000106764
   0.23%  libglib-2.0.so.0.5800.3       [.] g_slice_alloc
   0.21%  libglib-2.0.so.0.5800.3       [.] g_main_context_query
   0.21%  libwayland-client.so.0.3.0    [.] wl_display_read_events
   0.19%  libc-2.28.so                  [.] 0x00000000001067c7

for both 1.16 and 1.14, when glimagesink is not used, the load is about the same

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                                                                                                                                                                                              
 1589 vader     20   0  697636  35688  18404 S   1.3   0.6   0:02.31 gst-launch-1.0 filesrc location=../file.mkv ! matroskademux ! video/x-h264 ! queue ! vaapih264dec ! vaapipostproc ! fakesink sync=1                             
 1566 vader     20   0  627088  28812  18000 S   1.0   0.4   0:01.94 gst-launch-1.0 filesrc location=file.mkv ! matroskademux ! video/x-h264 ! queue ! vaapih264dec ! vaapipostproc ! fakesink sync=1

Note, in order to get this done;

i965-va-driver (1.7.3) is used on 1.14 and i965-va-driver-shaders (2.3.0) on 1.16.

Edited by Marc Leeman