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[BugFix][DeepSeek-V3.2] Fix backend selection logic for Blackwell #30195

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Merged
LucasWilkinson merged 1 commit into from
Dec 7, 2025
Merged

[BugFix][DeepSeek-V3.2] Fix backend selection logic for Blackwell #30195

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4 changes: 2 additions & 2 deletions vllm/platforms/cuda.py
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Original file line number Diff line number Diff line change
Expand Up @@ -182,8 +182,8 @@ def check_and_update_config(cls, vllm_config: "VllmConfig") -> None:

if vllm_config.attention_config.backend is None:
# Default case
if cls.is_device_capability(100):
# Blackwell => Force CutlassMLA.
if cls.is_device_capability(100) and not use_sparse:
# Blackwell => Force CutlassMLA (unless sparse, i.e. DSv3.2).
use_cutlass_mla = True
# Set the backend in AttentionConfig so it's used during
# backend selection
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