---
id: pr-sglang-22424
repo: sgl-project/sglang
pr: 22424
title: '[AMD] Use aiter CK layernorm2d for LayerNorm to reduce NSA indexer kernel launches'
author: 1am9trash
date: '2026-04-09'
url: https://github.com/sgl-project/sglang/pull/22424
source_category: upstream-code
architectures:
- sm100
tags:
- attention
techniques: []
hardware_features: []
kernel_types:
- attention
languages:
- python
captured_at: '2026-04-17'
status: merged
merge_sha: 628df31d088f612ffbc255b70b578cf9519d2a09
inclusion_reason: kernel file changes
changed_paths:
- python/sglang/srt/layers/attention/nsa/nsa_indexer.py
- python/sglang/srt/layers/layernorm.py
head_ref_oid: e43ee59ba132f69d177a5e22e8a92b7f74c73723
artifact_dir: evidence/pull-bundles/sglang/gh-22424
---
# [AMD] Use aiter CK layernorm2d for LayerNorm to reduce NSA indexer kernel launches

- Repository: `sgl-project/sglang`
- PR: [22424](https://github.com/sgl-project/sglang/pull/22424)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `python/sglang/srt/layers/attention/nsa/nsa_indexer.py`
- `python/sglang/srt/layers/layernorm.py`

## Evidence Bundle

`evidence/pull-bundles/sglang/gh-22424`
