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ac/gpu_info: add 256 to payload_entry_size to increase future task shader perf

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It has no effect because num_entries is 1K, but the table shows a lot of
potential.

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 2025-04-07 23:03:02 -04:00 • committed by Marge Bot
parent d7c903f258
commit 963147d7fd
1 changed files with 31 additions and 1 deletions
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32
src/amd/common/ac_gpu_info.c
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@ -2501,8 +2501,38 @@ void ac_get_task_info(const struct radeon_info *info,
{
/* Size of each payload entry in the task payload ring.
* Spec requires minimum 16K bytes.
*
* Add 256B to make consecutive payloads start on different memory channels to increase memory
* performance. (each 256B region maps to a different memory channel)
*
* Navi48 improvement from adding 256B to the payload entry size:
* (using https://github.com/zeux/niagara/discussions/41 at commit 745700c)
*
* With cluster culling (press K):
* |FPS for 16K |FPS for 16K+256 |
* num_entries|(payload ring size)|(payload ring size)|diff for +256
* -----------|-------------------|-------------------|-------------
* 1K | 582 (16 MB) | 582 (17 MB) | +0%
* 2K | 587 (32 MB) | 591 (33 MB) | +0.7%
* 4K | 608 (64 MB) | 611 (65 MB) | +0.5%
* 8K | 653 (128 MB) | 660 (130 MB) | +1.1%
* 16K | 765 (256 MB) | 789 (260 MB) | +3.1%
* 32K | 880 (512 MB) | 984 (520 MB) | +11.8%
* 64K | 874 (1024 MB) | 970 (1040 MB) | +11%
*
* Without cluster culling (don't press K):
* num_entries|FPS for 16K |FPS for 16K+256 |diff for +256
* -----------|-------------------|-------------------|-------------
* 1K | 578 | 578 | +0%
* 2K | 578 | 578 | +0%
* 4K | 574 | 578 | +0.7%
* 8K | 573 | 578 | +0.9%
* 16K | 565 | 579 | +2.4%
* 32K | 550 | 574 | +4.3%
* 64K | 550 | 574 | +4.3%
* # Adding 256 mitigates the performance loss from increasing num_entries.
*/
const uint32_t payload_entry_size = 16384;
const uint32_t payload_entry_size = 16384 + 256;
const uint16_t num_entries = get_task_num_entries(info->family);
const uint32_t draw_ring_bytes = num_entries * AC_TASK_DRAW_ENTRY_BYTES;
const uint32_t payload_ring_bytes = num_entries * payload_entry_size;