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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL GT3e] ~10% performance drop in most benchmarks"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97017">97017</a>
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<th>Summary</th>
<td>[SKL GT3e] ~10% performance drop in most benchmarks
</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>Other
</td>
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<th>OS</th>
<td>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
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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
</td>
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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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<th>i915 platform</th>
<td>SKL
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<pre>A change in drm-intel-nightly causes ~10% performance drop in benchmarks:
- 10-12% in GpuTest v0.7 "pixmark" (piano, volplosion, Julia32) tests
- 9-11% in GfxBench 4.x ALU, ALU2 and tessellation tests, both onscreen &
offscreen
- 9-12% in SynMark batch, geometry, pixel, vertex and compute shader tests
- 11% in GLB 2.7 Fill tests, 8% in T-Rex & Egypt onscreen, 2% in Egypt & T-Rex
offscreen
- 5-6% in Unigine Heaven & Valley
GpuTest and GLB 2.7 tests are run as windowed, rest is run as fullscreen in
monitor native resolution.
Basically everything except CPU bound 3D tests dropped, regardless of whether
it's:
- mostly GPU ALU or memory bandwidth limited
- fullscreened or windowed
- onscreen or offscreen
Drop happens only on SKL GT3e, there's no drop e.g. on SKL GT2 or HSW GT3e.
Drop happened between following 13th and 15th of July drm-intel-nightly
commits:
- Good: 5cd2699dfcf12a399553c3186b718667523a19fc
- Bad: 5cd2699dfcf12a399553c3186b718667523a19fc
It's fully reproducible just by changing kernel, but it cannot be automatically
bisected by Jenkins because large number of commits in-between are in
non-buildable state.</pre>
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