---
id: pr-vllm-20781
repo: vllm-project/vllm
pr: 20781
title: '[fix]: disable cutlass block scaled group gemm for EP'
author: djmmoss
date: '2025-07-11'
url: https://github.com/vllm-project/vllm/pull/20781
source_category: upstream-code
architectures:
- sm100
tags:
- gemm
- kernel-fusion
- moe
- quantization
techniques:
- kernel-fusion
hardware_features: []
kernel_types:
- gemm
- moe
- quantization
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: 5923ab9524e32006ffb9354c5340b6988a45fe3e
inclusion_reason: kernel file changes
changed_paths:
- csrc/quantization/cutlass_w8a8/moe/blockwise_scaled_group_mm_sm100.cu
- vllm/entrypoints/openai/serving_score.py
- vllm/model_executor/layers/fused_moe/cutlass_moe.py
- vllm/model_executor/layers/fused_moe/fused_moe.py
head_ref_oid: 05d9515764356f2aa4e74a8ef0c81dc71a853c94
artifact_dir: evidence/pull-bundles/vllm/gh-20781
---
# [fix]: disable cutlass block scaled group gemm for EP

- Repository: `vllm-project/vllm`
- PR: [20781](https://github.com/vllm-project/vllm/pull/20781)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `csrc/quantization/cutlass_w8a8/moe/blockwise_scaled_group_mm_sm100.cu`
- `vllm/entrypoints/openai/serving_score.py`
- `vllm/model_executor/layers/fused_moe/cutlass_moe.py`
- `vllm/model_executor/layers/fused_moe/fused_moe.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-20781`
