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ac/gpu_info: increase the attribute ring size for gfx12

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Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34432>
This commit is contained in:
Marek Olšák 2025-04-08 05:19:53 -04:00 • committed by Marge Bot
parent e783930b10
commit 0be5a3559a
1 changed files with 15 additions and 1 deletions
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16
src/amd/common/ac_gpu_info.c
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@ -1651,7 +1651,21 @@ bool ac_query_gpu_info(int fd, void *dev_p, struct radeon_info *info,
unsigned num_prim_exports = 0, num_pos_exports = 0;
if (info->gfx_level >= GFX12) {
info->attribute_ring_size_per_se = 1024 * 1024;
/* Navi48 results:
*
* Without NGG culling:
* - 1024 is the best for <=4 varyings, though longer GS waves may need more (see below).
* - 1400 is in between (a tiny bit slower for <=4 varyings, faster for >=6 varyings).
* - 1900 is the best for >=6 varyings because smaller sizes are throttled by not enough space.
*
* With NGG culling:
* - 1024 is the worst because NGG culling has longer GS waves, so it needs more space to
* prevent getting throttled even if it doesn't end up using it. gs_alloc_req doesn't
* deallocate the unused portion.
* - 1400 is the best for <=4 varyings.
* - 1900 is the best for >=6 varyings.
*/
info->attribute_ring_size_per_se = 1400 * 1024;
num_prim_exports = 16368; /* also includes gs_alloc_req */
num_pos_exports = 16384;
} else if (info->l3_cache_size_mb || info->family_overridden) {