---
id: pr-vllm-32615
repo: vllm-project/vllm
pr: 32615
title: '[Attention][MLA] Make FLASHINFER_MLA the default MLA backend on Blackwell, and TRTLLM the default prefill'
author: MatthewBonanni
date: '2026-01-19'
url: https://github.com/vllm-project/vllm/pull/32615
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 1a1fc3bbc062e3ad289447e6a13ce57971618b43
inclusion_reason: defer
changed_paths:
- .buildkite/test-amd.yaml
- .buildkite/test-pipeline.yaml
- .buildkite/test_areas/attention.yaml
- vllm/config/attention.py
- vllm/model_executor/layers/attention/mla_attention.py
- vllm/platforms/cuda.py
artifact_dir: evidence/pull-bundles/vllm/gh-32615
head_ref_oid: bfd7d24167205bb089a683b603d3bd18fa58d7f0
---
# [Attention][MLA] Make FLASHINFER_MLA the default MLA backend on Blackwell, and TRTLLM the default prefill

- Repository: `vllm-project/vllm`
- PR: [32615](https://github.com/vllm-project/vllm/pull/32615)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `.buildkite/test-amd.yaml`
- `.buildkite/test-pipeline.yaml`
- `.buildkite/test_areas/attention.yaml`
- `vllm/config/attention.py`
- `vllm/model_executor/layers/attention/mla_attention.py`
- `vllm/platforms/cuda.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-32615`
