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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#c22">Comment # 22</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>(In reply to Kenneth Graunke from <a href="show_bug.cgi?id=107510#c20">comment #20</a>)
<span class="quote">> There are too many things being tracked in this bug for me to know whether
> it's fixed or not.</span >
This bug tracks just regression coming from this commit:
-------------------------------------------------
commit 8d8222461f9d7f497d657c2c0eff70820986429b
Author: Jason Ekstrand <<a href="mailto:jason.ekstrand@intel.com">jason.ekstrand@intel.com</a>>
Date: Mon Jul 23 22:20:41 2018 -0700
intel/nir: Enable nir_opt_find_array_copies
-------------------------------------------------
Which re-introduces back the same issue that got fixed in Jason's revert of
"intel/nir: Call nir_lower_io_to_scalar_early" commit.
Timothy's patch series fixing the issue (but being explicitly limited to
tess/geom shaders) with following explanation:
Commit 8d8222461f9d7f49 caused substantially more URB messages in
geometry and tessellation shaders (due to enabling
nir_lower_io_to_scalar_early). This combines io again to avoid
this regression while still allowing link time optimisation of
components.
<span class="quote">> Vulkan regressions are likely fixed by
> 39aee57523a02552e7eae7df5da488e535aeb1eb (anv: Put MOCS in the correct
> location). But, that wouldn't affect any GL programs, so any GL regressions
> may still exist.</span >
If your commit didn't fix them, IMHO this bug is most likely explanation for
tessellation regression.</pre>
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