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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_NEW "
title="NEW - [GEN9+] large perf drop (up to 1/3) in most 3D benchmarks from force-enabling IOMMU"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111731">bug 111731</a>
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<table border="1" cellspacing="0" cellpadding="8">
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<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Summary</td>
<td>[GEN9(+)] large perf drop (up to 1/3) in most 3D benchmarks from force-enabling IOMMU
</td>
<td>[GEN9+] large perf drop (up to 1/3) in most 3D benchmarks from force-enabling IOMMU
</td>
</tr>
<tr>
<td style="text-align:right;">i915 platform</td>
<td>
</td>
<td>ICL
</td>
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [GEN9+] large perf drop (up to 1/3) in most 3D benchmarks from force-enabling IOMMU"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111731#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [GEN9+] large perf drop (up to 1/3) in most 3D benchmarks from force-enabling IOMMU"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111731">bug 111731</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>ICL-U with IOMMU
----------------
Performance didn't improve in any test from enabling IOMMU. Largest performance
drops are following:
* 30% SynMark VSTangent & ZBuffer
* 24% MemBW GPU write (with i965, 6-7% with Iris & higher FPS (*))
* 18% GLB 2.7 Egypt (windowed), SynMark VSDiffuse*
* 17% GpuTest v0.7 Triangle (windowed)
* 15% MemBW GPU blit (with i965, 20% with Iris & lower FPS (*))
* 14% GLB 2.7 T-Rex (windowed), SynMark HdrBloom
* 5-15% HEVC decode & download
* 11-12% GfxBench Manhattan 3.0 & 31, GpuTest Triangle, SynMark DrvRes
* 9-11% GfxBench T-Rex & CarChase, SynMark TerrainFly*
* 7-9% GfxBench AztecRuins, SynMark TexMem128, DeferredAA, ShMapVsm
* 5-7% Unigine Heaven & Valley, GfxBench ALU2, SynMark TexMem512, Deferred,
TerrainPan*, CSCloth
* 2-6% 8-bit <FullHD Media transcode
(*) Iris doesn't support E2E RBC, so in onscreen tests it uses more bandwidth /
frame, and therefore has lower perf.
PS. 30% perf drop from enabling IOMMU == >40% perf increase from disabling
IOMMU.</pre>
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