---
id: pr-flash-attention-2337
repo: Dao-AILab/flash-attention
pr: 2337
title: 'BUG: SeqlenInfo.create has a tile parameter that defaults to 128'
author: risan-raja
date: '2026-03-12'
url: https://github.com/Dao-AILab/flash-attention/pull/2337
source_category: upstream-code
architectures:
- sm100
tags:
- cuda kernel
techniques: []
hardware_features: []
kernel_types:
- attention
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: b900a5b3b078ae602d6a687e4314a2b3dc28cc30
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- flash_attn/cute/flash_bwd_preprocess.py
artifact_dir: evidence/pull-bundles/flash-attention/gh-2337
head_ref_oid: f500e0b0f2cd81a1cb0023022b7356ede0a3d290
---
# BUG: SeqlenInfo.create has a tile parameter that defaults to 128

- Repository: `Dao-AILab/flash-attention`
- PR: [2337](https://github.com/Dao-AILab/flash-attention/pull/2337)
- 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_bwd_preprocess.py`

## Evidence Bundle

`evidence/pull-bundles/flash-attention/gh-2337`
