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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 - [SKL][regression][bisected] Performance regression after linux 4.7"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102983">102983</a>
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<th>Summary</th>
<td>[SKL][regression][bisected] Performance regression after linux 4.7
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>DRI git
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
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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/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>ross@kallisti.us
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<pre>Created <span class=""><a href="attachment.cgi?id=134473" name="attach_134473" title="log from bisection">attachment 134473</a> <a href="attachment.cgi?id=134473&action=edit" title="log from bisection">[details]</a></span>
log from bisection
In Linux 4.7 and earlier, RimWorld (a steam game) ran at 60fps on my laptop.
With any later kernel release, the game runs at 30-40fps, stutters, and has
severe input latency. The issue is 100% reproducible. drm-tip (6aa0df37d3fc)
exhibits the same issue.
Hardware info: Skylake i7-6700HQ, Dell XP 9550. The laptop also has an nvidia
gpu. The issue affects both gpus, but testing purposes, I've only used the
intel gpu.
Software info: Debian stretch, x86_64
Bisection details: good commit v4.7, bad commit v4.8-rc1. This leads to a DRM
commit:
a59c2086fe9c489e0a2a86e080ba is the first bad commit
commit ea0000f0d369a59c2086fe9c489e0a2a86e080ba
Author: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
Date: Mon Jun 13 16:13:46 2016 +0200
drm/i915: Roll out the helper nonblock tracking
Right now still all blocking, no worker anywhere to be seen.
Reviewed-by: Maarten Lankhorst <<a href="mailto:maarten.lankhorst@linux.intel.com">maarten.lankhorst@linux.intel.com</a>>
Signed-off-by: Daniel Vetter <<a href="mailto:daniel.vetter@intel.com">daniel.vetter@intel.com</a>>
Link:
<a href="http://patchwork.freedesktop.org/patch/msgid/1465827229-1704-2-git-send-email-daniel.vetter@ffwll.ch">http://patchwork.freedesktop.org/patch/msgid/1465827229-1704-2-git-send-email-daniel.vetter@ffwll.ch</a>
To be attached:
- git bisect log
- dmesg w/ drm.debug=0xe from 4.7.8
- dmesg w/ drm.debug=0xe from drm-tip</pre>
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