---
id: pr-sglang-5210
repo: sgl-project/sglang
pr: 5210
title: 'feat: use fa3 mla by default on hopper'
author: zhyncs
date: '2025-04-12'
url: https://github.com/sgl-project/sglang/pull/5210
source_category: upstream-code
architectures:
- sm100
- sm90
tags:
- attention
- mla
techniques: []
hardware_features: []
kernel_types:
- attention
- mla
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: 57de7c6b5fb3fa99a386ee0500b25cdbf98eb1a2
inclusion_reason: kernel file changes
changed_paths:
- python/sglang/srt/layers/attention/flashattention_backend.py
- python/sglang/srt/model_executor/model_runner.py
- python/sglang/srt/utils.py
head_ref_oid: ccdf0bc863277c1bb868649c4a8790e86d86fb18
artifact_dir: evidence/pull-bundles/sglang/gh-5210
---
# feat: use fa3 mla by default on hopper

- Repository: `sgl-project/sglang`
- PR: [5210](https://github.com/sgl-project/sglang/pull/5210)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `python/sglang/srt/layers/attention/flashattention_backend.py`
- `python/sglang/srt/model_executor/model_runner.py`
- `python/sglang/srt/utils.py`

## Evidence Bundle

`evidence/pull-bundles/sglang/gh-5210`
