---
id: pr-flash-attention-2338
repo: Dao-AILab/flash-attention
pr: 2338
title: '[Fwd,SM100,CuTe] Fix split KV OOM with diff headdim + fix SM100 kwarg mismatch'
author: MatthewBonanni
date: '2026-03-12'
url: https://github.com/Dao-AILab/flash-attention/pull/2338
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- sm100
techniques: []
hardware_features:
- blackwell
kernel_types:
- attention
languages:
- cute-dsl
captured_at: '2026-05-16'
status: merged
merge_sha: bbe25bacff9f337568b66e69950e549df9839068
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- flash_attn/cute/flash_fwd_sm100.py
- flash_attn/cute/interface.py
artifact_dir: evidence/pull-bundles/flash-attention/gh-2338
head_ref_oid: 45c11c576b6ac57a00adb0f183cdec2d7159e721
---
# [Fwd,SM100,CuTe] Fix split KV OOM with diff headdim + fix SM100 kwarg mismatch

- Repository: `Dao-AILab/flash-attention`
- PR: [2338](https://github.com/Dao-AILab/flash-attention/pull/2338)
- Decision: `Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.`
- Reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.

## Changed Paths

- `flash_attn/cute/flash_fwd_sm100.py`
- `flash_attn/cute/interface.py`

## Evidence Bundle

`evidence/pull-bundles/flash-attention/gh-2338`
