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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [GEN7] 10-20% drop in SynMark terrain tests perf, 4% drop in Manhattan 3.0 perf"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103110">103110</a>
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<th>Summary</th>
<td>[GEN7] 10-20% drop in SynMark terrain tests perf, 4% drop in Manhattan 3.0 perf
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<th>Product</th>
<td>Mesa
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<th>Version</th>
<td>git
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<th>Hardware</th>
<td>Other
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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>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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<pre>On HSW GT2, performance dropped in following tests:
- 10-20% in 4 SynMark2 v7 Terrain tests
- 4% in GfxBench Manhattan 3.0
- 2% in GfxBench T-Rex
- 1-2% in GfxBench CarChase
GfxBench tests perf drop both for onscreen & offscreen versions.
Similar, but much smaller drops are visible also on BYT. I don't see drops in
these cases on SNB or GEN8+ platforms, so it seems GEN7 specific.
This drop happens between following commits:
- Good: 7f3eab03fe041bc28900a02f7ae503920753ea6b 2017-10-02 freedreno/a5xx: fix
missing restore state
- Bad: df6b320a83c89b6401fde888375529b3fc66f4fa 2017-10-03 etnaviv: Set up
unknown GC3000 states
Looking at the commits between this range, one of following changes could be
the cause for the drop:
- intel: Always set Cube Face Enables for all surfaces.
- refactor for: i965: Implement ARB_indirect_parameters
- glsl refactor done by Ian
Hopefully somebody has time to bisect this further.</pre>
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