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[LoRA] Set default MXFP4 LoRA backend to Marlin #30598

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Merged
vllm-bot merged 2 commits into from
Dec 18, 2025
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Merged

[LoRA] Set default MXFP4 LoRA backend to Marlin #30598

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4d5e993
[LoRA] Set default MXFP4 LoRA backend to Marlin
xyang16 Dec 12, 2025
950ae2a
Merge branch 'main' into lora
DarkLight1337 Dec 18, 2025
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10 changes: 5 additions & 5 deletions vllm/model_executor/layers/quantization/mxfp4.py
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Original file line number Diff line number Diff line change
Expand Up @@ -95,12 +95,12 @@ def get_mxfp4_backend_with_lora() -> Mxfp4Backend:
# SM120 needs this fix: https://github.com/triton-lang/triton/pull/8498
and (9, 0) <= current_platform.get_device_capability() < (11, 0)
)
if envs.VLLM_MXFP4_USE_MARLIN or not triton_kernels_supported:
logger.info_once("[get_mxfp4_backend_with_lora] Using Marlin backend")
return Mxfp4Backend.MARLIN
if envs.VLLM_MXFP4_USE_MARLIN is False and triton_kernels_supported:
logger.info_once("[get_mxfp4_backend_with_lora] Using Triton backend")
return Mxfp4Backend.TRITON

logger.info_once("[get_mxfp4_backend_with_lora] Using Triton backend")
return Mxfp4Backend.TRITON
logger.info_once("[get_mxfp4_backend_with_lora] Using Marlin backend")
return Mxfp4Backend.MARLIN


def get_mxfp4_backend(with_lora_support: bool) -> Mxfp4Backend:
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