<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - 1% perf drop in SynMark PSPom test from "intel/fs: Be more explicit about our placement of [un]zip""
href="https://bugs.freedesktop.org/show_bug.cgi?id=103940">103940</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>1% perf drop in SynMark PSPom test from "intel/fs: Be more explicit about our placement of [un]zip"
</td>
</tr>
<tr>
<th>Product</th>
<td>Mesa
</td>
</tr>
<tr>
<th>Version</th>
<td>git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>Drivers/DRI/i965
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-3d-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>eero.t.tamminen@intel.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Following commit was bisected (on SKL GT2):
-------------------------------------------------------------
commit 0d905597fe2997c89022c76cdf84dc4fba5eb055
Author: Jason Ekstrand <<a href="mailto:jason.ekstrand@intel.com">jason.ekstrand@intel.com</a>>
AuthorDate: Wed Sep 6 18:31:11 2017 -0700
Commit: Jason Ekstrand <<a href="mailto:jason.ekstrand@intel.com">jason.ekstrand@intel.com</a>>
CommitDate: Tue Nov 7 10:37:52 2017 -0800
intel/fs: Be more explicit about our placement of [un]zip
Before, we were careful to place the zip after the last of the split
instructions but did unzip on-demand. This changes things so that the
unzips go before all of the split instructions and the unzip comes
explicitly after all the split instructions. As a side-effect of this
change, we now emit the split instruction from highest SIMD group to
lowest instead of low to high. We could have kept the old behavior, but
it shouldn't matter and this made the code easier.
Reviewed-by: Iago Toral Quiroga <<a href="mailto:itoral@igalia.com">itoral@igalia.com</a>>
Cc: <a href="mailto:mesa-stable@lists.freedesktop.org">mesa-stable@lists.freedesktop.org</a>
-------------------------------------------------------------
To be the cause for the SynMark v7 PSPom drop visible on following platforms:
* 2% in BXT J4205, KBL GT3e
* 1-2% on BSW N3050
* 1% on BDW GT2, SKL GT2 & GT4e
This test didn't improve on any other platform and no other test was affected.
(I'm OK if this is closed as WONTFIX, I filed this more to document the perf
change.)</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>