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anv: disable task redistribution

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If task redistribution is enabled, then some mesh shaders read
garbage from task payload.

It may be a hardware bug, or it may be our bug. Who knows :(

This change will probably negatively affect performance of task
shader-enabled workloads on multi-slice GPUs, because mesh shaders
will be executed only on the slice where task shader was spawned.

Fixes: ef04caea9b ("anv: Implement Mesh Shading pipeline")

Acked-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16197>
This commit is contained in:
Marcin Ślusarz 2022-04-21 19:28:55 +02:00 • committed by Marge Bot
parent 6c0215eb09
commit 4eaecd7965
1 changed files with 6 additions and 1 deletions
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7
src/intel/vulkan/genX_pipeline.c
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@ -2216,7 +2216,12 @@ emit_task_state(struct anv_graphics_pipeline *pipeline)
redistrib.SmallTaskThreshold = 1; /* 2^N */
redistrib.TargetMeshBatchSize = devinfo->num_slices > 2 ? 3 : 5; /* 2^N */
redistrib.TaskRedistributionLevel = TASKREDISTRIB_BOM;
redistrib.TaskRedistributionMode = TASKREDISTRIB_RR_STRICT;
/* TODO: We have an unknown issue with Task Payload when task redistribution
* is enabled. Disable it for now.
* See https://gitlab.freedesktop.org/mesa/mesa/-/issues/7141
*/
redistrib.TaskRedistributionMode = TASKREDISTRIB_OFF;
}
}