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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - slight lags in youtube video 1080p since a change in kernel 4.15 related to drm/ttm"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105038">105038</a>
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<th>Summary</th>
<td>slight lags in youtube video 1080p since a change in kernel 4.15 related to drm/ttm
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>XOrg git
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Radeon
</td>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
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<th>Reporter</th>
<td>mister.freeman@laposte.net
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<pre>Created <span class=""><a href="attachment.cgi?id=137264" name="attach_137264" title="dmesg">attachment 137264</a> <a href="attachment.cgi?id=137264&action=edit" title="dmesg">[details]</a></span>
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 <<a href="mailto:christian.koenig@amd.com">christian.koenig@amd.com</a>>
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 <<a href="mailto:christian.koenig@amd.com">christian.koenig@amd.com</a>>
Reviewed-by: Felix Kuehling <<a href="mailto:Felix.Kuehling@amd.com">Felix.Kuehling@amd.com</a>>
Signed-off-by: Alex Deucher <<a href="mailto:alexander.deucher@amd.com">alexander.deucher@amd.com</a>>
reverting this patch solves the bug,
I have created a bug report in kernel's bugzilla :
<a href="https://bugzilla.kernel.org/show_bug.cgi?id=198511">https://bugzilla.kernel.org/show_bug.cgi?id=198511</a>
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 :
<a href="https://www.youtube.com/watch?v=YqtleU5YBlA">https://www.youtube.com/watch?v=YqtleU5YBlA</a></pre>
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