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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL GT4e] large perf drop (up to 27%) in most 3D benchmarks"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111731">111731</a>
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<th>Summary</th>
<td>[SKL GT4e] large perf drop (up to 27%) in most 3D benchmarks
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>DRI git
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>major
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<th>Priority</th>
<td>not set
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>eero.t.tamminen@intel.com
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<div>
<pre>Setup:
* HW: SKL i7-6770HQ
* OS: Ubuntu 18.04 desktop
* SW stack: git versions of drm-tip kernel, X and Mesa
Between following drm-tip kernel 5.3-rc8 commits:
* 2019-09-10_13-35-40 32c81a317364: drm-tip: 2019y-09m-10d-13h-34m-53s UTC
integration manifest
* 2019-09-11_15-07-28 b27acd37b7de: drm-tip: 2019y-09m-11d-15h-06m-37s UTC
integration manifest
Kernel performance dropped in most 3D benchmarks. Worst cases were:
* 27% SynMark CSDof (fullscreen)
* 20-25% GpuTest Triangle (1/2 screen window), SynMark VSTangent
* 20% Unigine Heaven, GpuTest Triangle (fullscreen), SynMark DeferredAA
With few months old git version of Mesa & X server, perf drop in SymMark Fill*
tests was also ~20%.
There seems also to be few percent improvement in synMark TexMem* tests kernel
performance at the same time, but that's visible only with specific Mesa driver
(i965, or Iris) and X server versions. Performance change in other tests than
memory bandwidth ones isn't significantly impacted by Mesa/Xorg version, only
by kernel.
This drop is specific SkullCanyon, it's not visible on others platforms (KBL
GT3e, SKL/BDW GT2, BXT). While 3D benchmarks are impacted most, there seems to
be marginal perf drop also in Media (transcode) tests.
Although this impacts only SkullCanyon, setting severity as major because the
perf drop is so large.</pre>
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