linux-kernel - Performance drop using deinterlace

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Date:   Sat, 18 Jun 2022 18:13:28 +0200 (CEST)
From:   Thomas Voegtle <tv@...96.de>
To:     Christian König <christian.koenig@....com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        amd-gfx@...ts.freedesktop.org
cc:     linux-kernel@...r.kernel.org
Subject: Performance drop using deinterlace_vaapi on 5.19-rcX

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@....com>
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@....com>
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