---
id: pr-vllm-38990
repo: vllm-project/vllm
pr: 38990
title: '[Bugfix][MoE] Fix 6-8% decode regression: prefer multi-stream shared expert overlap'
author: voipmonitor
date: '2026-04-05'
url: https://github.com/vllm-project/vllm/pull/38990
source_category: upstream-code
architectures:
- sm100
tags:
- decode
- kernel-fusion
- moe
techniques:
- kernel-fusion
hardware_features: []
kernel_types:
- decode
- moe
languages:
- python
captured_at: '2026-04-17'
status: merged
merge_sha: 228023b3a58f78ed028cb4e5fb4e078bb1574262
inclusion_reason: kernel file changes
changed_paths:
- vllm/model_executor/layers/fused_moe/runner/shared_experts.py
head_ref_oid: 12ab5e09b327adb0a04fefb966f0d538427840b4
artifact_dir: evidence/pull-bundles/vllm/gh-38990
---
# [Bugfix][MoE] Fix 6-8% decode regression: prefer multi-stream shared expert overlap

- Repository: `vllm-project/vllm`
- PR: [38990](https://github.com/vllm-project/vllm/pull/38990)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `vllm/model_executor/layers/fused_moe/runner/shared_experts.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-38990`
