Performance drop using deinterlace_vaapi on 5.19-rcX

[Thomas Voegtle]

Hello,

I noticed a performance drop encoding a mpeg file to a h264 video using
the vaapi option deinterlace_vaapi on a Haswell i5-4570 with Linux
5.19-rc1.

A 10 minute long video takes normally 41s to convert, now with 5.19-rc1
it takes about 2m 36s.

My ffmpeg line is:
ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128
-hwaccel_output_format vaapi -i test.vdr -vf 'deinterlace_vaapi' -c:v
h264_vaapi

Removing the option deinterlace_vaapi shows no difference in performance 
between 5.18 and 5.19-rcX.


I bisected this down to:

commit 047a1b877ed48098bed71fcfb1d4891e1b54441d
Author: Christian König <christian.koenig@xxxxxxx>
Date:   Tue Nov 23 09:33:07 2021 +0100

    dma-buf & drm/amdgpu: remove dma_resv workaround


and wasn't able to revert this one on top of 5.19-rcX.

I tried the predecessor commit:

commit 73511edf8b196e6f1ccda0fdf294ff57aa2dc9db (HEAD)
Author: Christian König <christian.koenig@xxxxxxx>
Date:   Tue Nov 9 11:08:18 2021 +0100

    dma-buf: specify usage while adding fences to dma_resv obj v7

which is fine.

Using ffmpeg 5.0.1 with libva 2.10.0 and intel vaapi driver 2.4.1


 Best regards,

    Thomas