Hi,
On 16.11.2018 10.33, Francisco Jerez wrote:
Kenneth Graunke <kenn...@whitecape.org> writes:
[...]
Perhaps we'll get both configs working, and then will want to be able
to select between them. I question whether the additional URB is truly
that valuable - how large are the actual gains? - considering that we
have to stall in order to reconfigure everything anyway...
It's more about value of additional space for caching textures.
One can calculate required max URB space when GS/TS isn't used, whereas
textures can fill all available cache. For example, if draw does just a
single quad, L3 is better utilized with minimal URB space and leaving
rest for texture caching.
That just means that the update frequency needs to be low enough for the
stall overhead to be negligible -- E.g. at batch buffer boundaries or
wherever we're getting stalled anyway.
- Eero
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