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<body><span class="vcard"><a class="email" href="mailto:eero.t.tamminen@intel.com" title="Eero Tamminen <eero.t.tamminen@intel.com>"> <span class="fn">Eero Tamminen</span></a>
</span> changed
<a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [BXT] up to 6% performance drop with "i965: Set "Subslice Hashing Mode" to 16x16 on Apollolake""
href="https://bugs.freedesktop.org/show_bug.cgi?id=102272">bug 102272</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>WONTFIX
</td>
<td>---
</td>
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<td style="text-align:right;">Status</td>
<td>RESOLVED
</td>
<td>REOPENED
</td>
</tr></table>
<p>
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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [BXT] up to 6% performance drop with "i965: Set "Subslice Hashing Mode" to 16x16 on Apollolake""
href="https://bugs.freedesktop.org/show_bug.cgi?id=102272#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [BXT] up to 6% performance drop with "i965: Set "Subslice Hashing Mode" to 16x16 on Apollolake""
href="https://bugs.freedesktop.org/show_bug.cgi?id=102272">bug 102272</a>
from <span class="vcard"><a class="email" href="mailto:eero.t.tamminen@intel.com" title="Eero Tamminen <eero.t.tamminen@intel.com>"> <span class="fn">Eero Tamminen</span></a>
</span></b>
<pre>There was also following perf drops during the same time frame, which I assume
are due to same change:
- 2% GpuTest v0.7 PixMark Piano
- 1% GpuTest v0.7 PixMark Volplosion
And now that <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Up to 20% perf drop in texture sampling tests with "i965/surface_state: Get the aux usage from the miptree code""
href="show_bug.cgi?id=102258">bug 102258</a> is fixed, SynMark Anisotropic filtering test
performance is still 6-7% lower than it was before that bug.
Except for terrain tessellation tests, all the dropping test-cases use
anisotropic filter.
So, I think both cases that have a lot of really small triangles, and/or where
usage of anisotropic filtering has clear impact for the performance, suffer
from this change.
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Up to 20% perf drop in texture sampling tests with "i965/surface_state: Get the aux usage from the miptree code""
href="show_bug.cgi?id=102258">Bug 102258</a> may have hidden also other impacts of this change, so it makes sense
to re-test the impact of the hash mode on 18 EU BXT where it's more visible.
The affected test-cases were:
- GLB 2.7 Fill*
- GpuTest v0.7 GiMark, FurMark, Piano, Volplosion & Triangle*
- SynMark v7 TerrainPanTess, TerrainFlyTess, TexFilterAniso, TexFilterTri*,
TexMem128, TexMem512* & ZBuffer*
Potentially also Unigine Valley 1.0.
(*) These were improved, others regressed with 8x8 -> 16x16 change.</pre>
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