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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [GEN8+] up to 10% perf drop on several 3D benchmarks"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107706">107706</a>
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<th>Summary</th>
<td>[GEN8+] up to 10% perf drop on several 3D benchmarks
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>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>Drivers/DRI/i965
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<th>Assignee</th>
<td>intel-3d-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-3d-bugs@lists.freedesktop.org
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<pre>There's up to 10% performance drop on *all* GEN8+ platforms, exactly same as in
<a class="bz_bug_link
bz_status_VERIFIED bz_closed"
title="VERIFIED FIXED - [GEN8+] up to 10% perf drop on several 3D benchmarks"
href="show_bug.cgi?id=107510">bug 107510</a>.
On SKL GT2, the regressions are following:
- 10% GfxBench Tessellation (onscreen & offscreen)
- 5% SynMark2 GSCloth
- 2-3% GpuTest Julia FP64
- 1-2% Unigine Heaven (high quality with tessellation, no AA)
- 1% GfxBench ALU2 (onscreen & offscreen), SynMark PSPom
On other GEN8+ platforms the regressing cases are the same, but percentages
differ somewhat. Performance didn't improve in any test.
Setup:
- Mesa from git
- drm-tip kernel and X server git versions within couple of months
- Modifier support enabled (shouldn't matter as offscreen versions also
regress)
Regressions happen between following Mesa git versions:
* 855af9a5a2: 2018-08-23 16:00:28 "travis: use python3 for the autoconf builds"
* 7f745c19c1: 2018-08-24 16:35:24 "docs: Update calendar, news, relnotes for
18.1.7"
(Jason's array splitting commits seems most likely thing affecting these.)</pre>
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