---
id: pr-vllm-30897
repo: vllm-project/vllm
pr: 30897
title: '[NVFP4][Perf] Tune NVFP4 input quant kernel for small batch size'
author: mgoin
date: '2025-12-21'
url: https://github.com/vllm-project/vllm/pull/30897
source_category: upstream-code
architectures:
- sm100
tags:
- fp4
- kernel-fusion
- nvfp4
- quantization
techniques:
- kernel-fusion
hardware_features:
- fp4
- nvfp4
kernel_types:
- quantization
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: 06d490282f2bab6922137eb5230be9df5ebbe9c4
inclusion_reason: kernel file changes
changed_paths:
- benchmarks/kernels/bench_nvfp4_quant.py
- csrc/quantization/fp4/activation_nvfp4_quant_fusion_kernels.cu
- csrc/quantization/fp4/nvfp4_experts_quant.cu
- csrc/quantization/fp4/nvfp4_quant_kernels.cu
- csrc/quantization/fp4/nvfp4_utils.cuh
head_ref_oid: 02aad69c2c08b4b3c96203684afe4b2d7fedb3eb
artifact_dir: evidence/pull-bundles/vllm/gh-30897
---
# [NVFP4][Perf] Tune NVFP4 input quant kernel for small batch size

- Repository: `vllm-project/vllm`
- PR: [30897](https://github.com/vllm-project/vllm/pull/30897)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `benchmarks/kernels/bench_nvfp4_quant.py`
- `csrc/quantization/fp4/activation_nvfp4_quant_fusion_kernels.cu`
- `csrc/quantization/fp4/nvfp4_experts_quant.cu`
- `csrc/quantization/fp4/nvfp4_quant_kernels.cu`
- `csrc/quantization/fp4/nvfp4_utils.cuh`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-30897`
