---
id: pr-tensorrt-llm-12445
repo: NVIDIA/TensorRT-LLM
pr: 12445
title: '[https://nvbugs/5983390][fix] Remove redundant D2H sync to optimize perf'
author: hyukn
date: '2026-03-24'
url: https://github.com/NVIDIA/TensorRT-LLM/pull/12445
source_category: upstream-code
architectures:
- sm100
tags:
- DSA
- attention_kv
- benchmark_test
- memory_primitives
techniques: []
hardware_features: []
kernel_types:
- attention
- memory
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: d8eb3a601c9d4d98a8e6b09fd0df78423cfd7825
inclusion_reason: Preserve page/KV/layout and plan-run contracts; profile memory traffic separately from math utilization.
changed_paths:
- tensorrt_llm/_torch/attention_backend/sparse/dsa.py
artifact_dir: evidence/pull-bundles/tensorrt-llm/gh-12445
head_ref_oid: 2ef06624b0c0d80906c1c24ffbe47a3cf847a1c5
---
# [https://nvbugs/5983390][fix] Remove redundant D2H sync to optimize perf

- Repository: `NVIDIA/TensorRT-LLM`
- PR: [12445](https://github.com/NVIDIA/TensorRT-LLM/pull/12445)
- Decision: `Preserve page/KV/layout and plan-run contracts; profile memory traffic separately from math utilization.`
- Reason: Preserve page/KV/layout and plan-run contracts; profile memory traffic separately from math utilization.

## Changed Paths

- `tensorrt_llm/_torch/attention_backend/sparse/dsa.py`

## Evidence Bundle

`evidence/pull-bundles/tensorrt-llm/gh-12445`
