https://bugs.freedesktop.org/show_bug.cgi?id=88658
Bug ID: 88658
Summary: Slow video playback on Kabini
Product: Mesa
Version: unspecified
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/radeonsi
Assignee: dri-devel at lists.freedesktop.org
Reporter: jtossenb at gmail.com
QA Contact: dri-devel at lists.freedesktop.org
I am using a 64-bit Kabini based system (AMD Athlon 5350) with Kodi 14.0 on an
up-to-date Arch linux.
Kodi plays this
https://dl-web.dropbox.com/get/hi10p_sample.mp4?w=AAC8qnXfS0xxWbd5Fc2bkvWxMxeqlUiSkL-Dxe5C5BDVyw&dl=1&_subject_uid=6760021
small sample file fine with kernel 3.16.x, but with kernel >= 3.17 the playback
is only 1 fps (like a slideshow). It is a hi10p video, so Kodi uses pure
software decoding.
I've done a git bisect between 3.16 and 3.17-rc1 and found that
02376d8282b88f07d0716da6155094c8760b1a13 is the first bad commit.
commit 02376d8282b88f07d0716da6155094c8760b1a13
Author: Michel Dänzer <michel.daenzer at amd.com>
Date: Thu Jul 17 19:01:08 2014 +0900
drm/radeon: Allow write-combined CPU mappings of BOs in GTT (v2)
v2: fix rebase onto drm-fixes
Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
Reviewed-by: Christian König <christian.koenig at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Then I applied the patch found in comment 30 of bug 84627 attachment 11024 (as
I use 64-bit system).
This patch worked around the problem on 3.17 and on the latest 3.19-rc5 kernel
as well and now Kodi plays the above video 24 fps.
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