---
id: pr-tensorrt-llm-13808
repo: NVIDIA/TensorRT-LLM
pr: 13808
title: '[None][feat] Update FMHA cubins for head_dim 80'
author: yuxianq
date: '2026-05-13'
url: https://github.com/NVIDIA/TensorRT-LLM/pull/13808
source_category: upstream-code
architectures:
- sm100
tags:
- attention kernel
- attention_kv
- benchmark_test
- blackwell
- cuda kernel
- memory_primitives
techniques: []
hardware_features:
- blackwell
kernel_types:
- attention
- memory
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: f0d926c87417747ee00941fc7d4708f356ccbcf3
inclusion_reason: Preserve page/KV/layout and plan-run contracts; profile memory traffic separately from math utilization.
changed_paths:
- cpp/tensorrt_llm/kernels/fmhaDispatcher.cpp
- cpp/tensorrt_llm/kernels/trtllmGenKernels/fmha/cubin/kernelMetaInfo.h
- tests/unittest/trt/attention/test_gpt_attention.py
- tests/unittest/utils/util.py
artifact_dir: evidence/pull-bundles/tensorrt-llm/gh-13808
head_ref_oid: 94d5bc416394bd56f1dedb4465fbdd3ff994512a
---
# [None][feat] Update FMHA cubins for head_dim 80

- Repository: `NVIDIA/TensorRT-LLM`
- PR: [13808](https://github.com/NVIDIA/TensorRT-LLM/pull/13808)
- Decision: `Preserve page/KV/layout and plan-run contracts; profile memory traffic separately from math utilization.`
- Reason: Preserve page/KV/layout and plan-run contracts; profile memory traffic separately from math utilization.

## Changed Paths

- `cpp/tensorrt_llm/kernels/fmhaDispatcher.cpp`
- `cpp/tensorrt_llm/kernels/trtllmGenKernels/fmha/cubin/kernelMetaInfo.h`
- `tests/unittest/trt/attention/test_gpt_attention.py`
- `tests/unittest/utils/util.py`

## Evidence Bundle

`evidence/pull-bundles/tensorrt-llm/gh-13808`
