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<div class="moz-cite-prefix">That's true, but for now we are stuck
with the implicit sync for quite a number of use cases.<br>
<br>
My problem is rather that we already tried this and it backfired
immediately.<br>
<br>
I do remember that it was your patch who introduced the pipeline
sync flag handling and I warned that this could be problematic.
You then came back with a QA result saying that this is indeed
causing a huge performance drop in one test case and we need to do
something else. Together we then came up with the different
handling between implicit and explicit sync.<br>
<br>
But I can't find that stupid mail thread any more. I knew that it
was a couple of years ago when we started with the explicit sync
for Vulkan.<br>
<br>
Christian.<br>
<br>
Am 10.06.20 um 08:29 schrieb Zhou, David(ChunMing):<br>
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<p class="msipheader4d0fcdd7"
style="margin:0in;margin-bottom:.0001pt"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0078D7">[AMD
Official Use Only - Internal Distribution Only]</span><o:p></o:p></p>
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<p class="MsoNormal">Not sue if this is right direction, I think
usermode wants all synchronizations to be explicit. Implicit
sync often confuses people who don’t know its history. I
remember Jason from Intel is driving explicit synchronization
through the Linux ecosystem, which even removes implicit sync
of shared buffer.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-David<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> amd-gfx
<a class="moz-txt-link-rfc2396E" href="mailto:amd-gfx-bounces@lists.freedesktop.org"><amd-gfx-bounces@lists.freedesktop.org></a>
<b>On Behalf Of </b>Marek Olšák<br>
<b>Sent:</b> Tuesday, June 9, 2020 6:58 PM<br>
<b>To:</b> amd-gfx mailing list
<a class="moz-txt-link-rfc2396E" href="mailto:amd-gfx@lists.freedesktop.org"><amd-gfx@lists.freedesktop.org></a><br>
<b>Subject:</b> [PATCH] drm/amdgpu: remove distinction
between explicit and implicit sync (v2)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal">This enables a full pipeline sync for
implicit sync. It's Christian's patch with the driver
version bumped. With this, user mode drivers don't have to
wait for idle at the end of gfx IBs.<o:p></o:p></p>
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<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal">Any concerns?<o:p></o:p></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Marek<o:p></o:p></p>
</div>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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