https://bugs.freedesktop.org/show_bug.cgi?id=105038
Bug ID: 105038
Summary: slight lags in youtube video 1080p since a change in
kernel 4.15 related to drm/ttm
Product: DRI
Version: XOrg git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: DRM/Radeon
Assignee: [email protected]
Reporter: [email protected]
Created attachment 137264
--> https://bugs.freedesktop.org/attachment.cgi?id=137264&action=edit
dmesg
Hello,
I have a radeon HD4650 pcie, I use the radeon driver,
since a new algorithm for drm/ttm introduced in kernel 4.15.x then I notice a
performance loss in video playback, especially when the format is 1080p ( for
example youtube video ), some lags are visible ( for example travelling images,
vertical scroll of the credits in a video ),
the bug has been introduced since this commit :
commit 648bc3574716400acc06f99915815f80d9563783
Author: Christian König <[email protected]>
Date: Thu Jul 6 09:59:43 2017 +0200
drm/ttm: add transparent huge page support for DMA allocations v2
Try to allocate huge pages when it makes sense.
v2: fix comment and use ifdef
Signed-off-by: Christian König <[email protected]>
Reviewed-by: Felix Kuehling <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
reverting this patch solves the bug,
I have created a bug report in kernel's bugzilla :
https://bugzilla.kernel.org/show_bug.cgi?id=198511
Christian König advices me to open a bug report here for drm/radeon,
I have filmed my screen in order to demonstrate the effect of this bug, you can
see my video here :
https://www.youtube.com/watch?v=YqtleU5YBlA
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