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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=107510">107510</a>
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<th>Summary</th>
<td>[GEN8+] up to 10% perf drop on several 3D benchmarks
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>git
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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>Keywords</th>
<td>regression
</td>
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<th>Severity</th>
<td>normal
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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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<p>
<div>
<pre>There's up to 10% performance drop on *all* GEN8+ platforms.
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:
0ea243dcd502e18fde160179faf90639fb012288 2018-07-30 16:31:05 freedreno/a5xx:
fix txf_ms
d5175d21c7e8e205a1ea80644b3cc887a586e6e1 2018-08-02 23:30:57 nir: add fall
through comment to nir_gather_info
Between these there are a lot of commits that could potentially affect
performance, but I don't currently have time to bisect this (maybe next week).
I filed this in hopes that somebody else would have...</pre>
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