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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - 15% perf drop in DrvRes with "i965/miptree: Use num_samples of 1 instead of 0 for single-sampled""
href="https://bugs.freedesktop.org/show_bug.cgi?id=102260">102260</a>
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<th>Summary</th>
<td>15% perf drop in DrvRes with "i965/miptree: Use num_samples of 1 instead of 0 for single-sampled"
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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
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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>
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<pre>Bisecting on SKL GT2 revealed following commit:
----------------------------------------------------
commit 76e2f390f9863a356d1419982dec705260d67eff
Author: Topi Pohjolainen <<a href="mailto:topi.pohjolainen@intel.com">topi.pohjolainen@intel.com</a>>
AuthorDate: Wed Jul 19 09:25:19 2017 +0300
Commit: Topi Pohjolainen <<a href="mailto:topi.pohjolainen@intel.com">topi.pohjolainen@intel.com</a>>
CommitDate: Thu Jul 20 11:32:21 2017 +0300
i965/miptree: Use num_samples of 1 instead of 0 for single-sampled
----------------------------------------------------
To be responsible for large performance drop in SynMark v7 DrvRes test.
Drop is largest (~15%) on SKL & KBL GT2, on most platforms it's 3-5%, on SKL
GT4e there's no measurable impact.
(Test is run in FullHD fullscreen.)
>From the commit message it seems that it should be just refactoring + potential
bug fix i.e. this large perf impact is unexpected. Other tests beside DrvRes
weren't noticeably impacted.</pre>
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