---
id: pr-vllm-34924
repo: vllm-project/vllm
pr: 34924
title: '[Perf] Enable FlashInfer DeepGEMM swapAB on SM90 by default'
author: mgoin
date: '2026-02-24'
url: https://github.com/vllm-project/vllm/pull/34924
source_category: upstream-code
architectures:
- sm100
- sm90
tags:
- gemm
- kernel-fusion
techniques:
- kernel-fusion
hardware_features: []
kernel_types:
- gemm
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: a4bd661fb33b94e952b598624f1b9e60f380d325
inclusion_reason: semantic match with file changes
changed_paths:
- tests/compile/fusions_e2e/test_tp1_quant.py
- vllm/envs.py
head_ref_oid: 22b08e1a8c2cf6e5160694d41a59dd2b20010c2e
artifact_dir: evidence/pull-bundles/vllm/gh-34924
---
# [Perf] Enable FlashInfer DeepGEMM swapAB on SM90 by default

- Repository: `vllm-project/vllm`
- PR: [34924](https://github.com/vllm-project/vllm/pull/34924)
- Decision: `semantic match with file changes`
- Reason: semantic match with file changes

## Changed Paths

- `tests/compile/fusions_e2e/test_tp1_quant.py`
- `vllm/envs.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-34924`
