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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [KBL] 60% perf drop in GfxBench Manhattan 3.1 with "i965/fs: Switch to the constant cache for uniform pull constants""
href="https://bugs.freedesktop.org/show_bug.cgi?id=99256">99256</a>
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<th>Summary</th>
<td>[KBL] 60% perf drop in GfxBench Manhattan 3.1 with "i965/fs: Switch to the constant cache for uniform pull constants"
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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
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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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<p>
<div>
<pre>While Francisco's constant cache patch series helped perf on the other
platforms, *on KBL* (i7-7500U / GT2) it caused a huge perf regression in
(GfxBench 4.0) Manhattan 3.1.
"i965/fs: Switch to the constant cache for uniform pull constants" commit drops
the performance by 60% and "i965/fs: Fetch one cacheline of pull constants at a
time" commit improves that by 50%, so the combined drop is ~40%.
GfxBench CarChase (gl_4 test) test perf also dropped a bit, by 10-15%.
Note: SynMark ShMapPcf test still improved on KBL, by ~30% (same as on SKL GT2
& GT4e).</pre>
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