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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [GEN8+] up to 10% perf drop on several 3D benchmarks"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107510#c14">Comment # 14</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [GEN8+] up to 10% perf drop on several 3D benchmarks"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107510">bug 107510</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>Because exactly same tests were affected both times this perf regression was
introduced to Mesa, I think it's also the cause for the small regressions in
the listed fragment shader bound tests:
- GpuTest v0.7 Julia FP64
- GfxBench ALU2
- Unigine Heaven
- SynMark PSPom
Not just for the larger regressions in the 2 Tessellation & Geometry shader
tests.
Of these, PSPom regression was fixed between these commits:
18cc65edf8: 2018-10-15 17:56:12 i965: Drop assert about number of uniforms in
ARB handling
322a919a41: 2018-10-16 11:47:55 anv: Implement VK_EXT_pci_bus_info
(My guess is that "nir: Copy propagation between blocks" commit fixed it.)
Timothy's latest patch series:
<a href="https://patchwork.freedesktop.org/series/51642/">https://patchwork.freedesktop.org/series/51642/</a>
Fixes just the larger tessellation & geometry shader regressions, not the
smaller fragment shader ones (expected as latest version disables the
optimization pass for fragment stage).</pre>
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