---
id: pr-sglang-21595
repo: sgl-project/sglang
pr: 21595
title: Change default mm-attention backend from triton_attn to fa4
author: JustinTong0323
date: '2026-04-01'
url: https://github.com/sgl-project/sglang/pull/21595
source_category: upstream-code
architectures:
- sm100
- sm90
tags:
- attention
techniques: []
hardware_features: []
kernel_types:
- attention
languages:
- python
- triton
captured_at: '2026-04-17'
status: merged
merge_sha: 87a27682693e261e32bf0163c1ac8b7021def908
inclusion_reason: kernel file changes
changed_paths:
- python/sglang/srt/layers/attention/vision.py
head_ref_oid: 7edb529f884c18161015da03ce1c4ebdd05a702f
artifact_dir: evidence/pull-bundles/sglang/gh-21595
---
# Change default mm-attention backend from triton_attn to fa4

- Repository: `sgl-project/sglang`
- PR: [21595](https://github.com/sgl-project/sglang/pull/21595)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `python/sglang/srt/layers/attention/vision.py`

## Evidence Bundle

`evidence/pull-bundles/sglang/gh-21595`
