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radeonsi: fix the VGT performance tweak for small instances

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Based on the VGT spec.

The Vulkan driver doesn't do it optimally and they plan to fix it.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
This commit is contained in:
Marek Olšák 2016-09-08 01:42:06 +02:00
parent a67d81580b
commit a5a2cc530c
1 changed files with 6 additions and 5 deletions
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11
src/gallium/drivers/radeonsi/si_state_draw.c
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@ -318,14 +318,15 @@ static unsigned si_get_ia_multi_vgt_param(struct si_context *sctx,
wd_switch_on_eop = true;
/* Performance recommendation for 4 SE Gfx7-8 parts if
* instances are smaller than a primgroup. Ignore the fact
* primgroup_size is a primitive count, not vertex count.
* Don't do anything for indirect draws.
* instances are smaller than a primgroup.
* Assume indirect draws always use small instances.
* This is needed for good VS wave utilization.
*/
if (sctx->b.chip_class <= VI &&
sctx->b.screen->info.max_se >= 4 &&
!info->indirect &&
info->instance_count > 1 && info->count < primgroup_size)
(info->indirect ||
(info->instance_count > 1 &&
si_num_prims_for_vertices(info) < primgroup_size)))
wd_switch_on_eop = true;
/* Required on CIK and later. */