| 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 | dri-devel@lists.freedesktop.org |
| Reporter | mister.freeman@laposte.net |
Created attachment 137264 [details] 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 <christian.koenig@amd.com> 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 <christian.koenig@amd.com> Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 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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