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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [GEN9+] 2% perf drop in Unigine Heaven, 1% in Valley"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109505">109505</a>
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<th>Summary</th>
<td>[GEN9+] 2% perf drop in Unigine Heaven, 1% in Valley
</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>x86-64 (AMD64)
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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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<p>
<div>
<pre>Setup:
* Ubuntu 18.04
* Unity / compiz desktop
* X server git version with modifiers enabled
* drm-tip kernel v4.19 or v4.20
* Mesa git version
Between following Mesa commits:
* 2018-12-13 17:49:48 9ebc00f32e: i965: Enable nir_opt_idiv_const for 32 and
64-bit integers
* 2018-12-14 17:40:27 5c454661c6: i965/gen9: Add workarounds for object
preemption
Unigine Heaven 4.0 and Valley 1.0 performance regressed.
On SKL GT4e, perf drop is:
- 2% in Heaven (high quality, tessellation enabled, no MSAA, fullscreen)
- 1% in Valley
On slower machines, drop is somewhat smaller. Drop is GEN9+ specific, or at
least it's not visible on older platforms. There may be some minuscule
regression also in heavier GfxBench tests, but it's too smaller to say for
sure.</pre>
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