---
id: pr-vllm-36178
repo: vllm-project/vllm
pr: 36178
title: '[Bugfix][MLA] Add logits size budget to sparse indexer prefill chunking'
author: LucasWilkinson
date: '2026-04-01'
url: https://github.com/vllm-project/vllm/pull/36178
source_category: upstream-code
architectures:
- sm100
tags:
- attention
- mla
- prefill
techniques: []
hardware_features: []
kernel_types:
- attention
- mla
- prefill
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: eb47454987452c7ee10253839b0c7289c3352c60
inclusion_reason: kernel file changes
changed_paths:
- tests/v1/attention/test_sparse_mla_backends.py
- vllm/envs.py
- vllm/model_executor/layers/sparse_attn_indexer.py
- vllm/v1/attention/backends/mla/indexer.py
head_ref_oid: 33d0a2268488d28aee4c9e5eb77092c22dd041c7
artifact_dir: evidence/pull-bundles/vllm/gh-36178
---
# [Bugfix][MLA] Add logits size budget to sparse indexer prefill chunking

- Repository: `vllm-project/vllm`
- PR: [36178](https://github.com/vllm-project/vllm/pull/36178)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `tests/v1/attention/test_sparse_mla_backends.py`
- `vllm/envs.py`
- `vllm/model_executor/layers/sparse_attn_indexer.py`
- `vllm/v1/attention/backends/mla/indexer.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-36178`
