---
id: pr-vllm-34109
repo: vllm-project/vllm
pr: 34109
title: '[Kernel] Refactor FlashInfer allreduce for mnnvl backend'
author: hjjq
date: '2026-02-26'
url: https://github.com/vllm-project/vllm/pull/34109
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 71dfce6aa6cc14d016154b4e3fd8cc40c05415f9
inclusion_reason: defer
changed_paths:
- benchmarks/kernels/benchmark_device_communicators.py
- benchmarks/kernels/benchmark_fused_collective.py
- tests/compile/passes/distributed/test_fusion_all_reduce.py
- vllm/compilation/passes/fusion/allreduce_rms_fusion.py
- vllm/distributed/device_communicators/cuda_communicator.py
- vllm/distributed/device_communicators/flashinfer_all_reduce.py
- vllm/envs.py
artifact_dir: evidence/pull-bundles/vllm/gh-34109
head_ref_oid: 746c8fed7b4c6b6dccdc79ba8504ffc90fd5a4b0
---
# [Kernel] Refactor FlashInfer allreduce for mnnvl backend

- Repository: `vllm-project/vllm`
- PR: [34109](https://github.com/vllm-project/vllm/pull/34109)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `benchmarks/kernels/benchmark_device_communicators.py`
- `benchmarks/kernels/benchmark_fused_collective.py`
- `tests/compile/passes/distributed/test_fusion_all_reduce.py`
- `vllm/compilation/passes/fusion/allreduce_rms_fusion.py`
- `vllm/distributed/device_communicators/cuda_communicator.py`
- `vllm/distributed/device_communicators/flashinfer_all_reduce.py`
- `vllm/envs.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-34109`
