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allow disable flashinfer prefill #25276

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Merged
merged 1 commit into from
Sep 19, 2025
Merged

allow disable flashinfer prefill #25276

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3 changes: 3 additions & 0 deletions vllm/envs.py
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@
VLLM_CONFIG_ROOT: str = os.path.expanduser("~/.config/vllm")
VLLM_USAGE_STATS_SERVER: str = "https://stats.vllm.ai"
VLLM_NO_USAGE_STATS: bool = False
VLLM_DISABLE_FLASHINFER_PREFILL: bool = False
VLLM_DO_NOT_TRACK: bool = False
VLLM_USAGE_SOURCE: str = ""
VLLM_CONFIGURE_LOGGING: int = 1
Expand Down Expand Up @@ -479,6 +480,8 @@ def get_vllm_port() -> Optional[int]:
lambda: os.environ.get("VLLM_USAGE_STATS_SERVER", "https://stats.vllm.ai"),
"VLLM_NO_USAGE_STATS":
lambda: os.environ.get("VLLM_NO_USAGE_STATS", "0") == "1",
"VLLM_DISABLE_FLASHINFER_PREFILL":
lambda: os.environ.get("VLLM_DISABLE_FLASHINFER_PREFILL", "0") == "1",
"VLLM_DO_NOT_TRACK":
lambda: (os.environ.get("VLLM_DO_NOT_TRACK", None) or os.environ.get(
"DO_NOT_TRACK", None) or "0") == "1",
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3 changes: 2 additions & 1 deletion vllm/v1/attention/backends/mla/common.py
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Original file line number Diff line number Diff line change
Expand Up @@ -412,7 +412,8 @@ def __post_init__(self):
def use_flashinfer_prefill() -> bool:
# For blackwell default to flashinfer prefill if it's available since
# it is faster than FA2.
return (flashinfer_available and not envs.VLLM_USE_CUDNN_PREFILL
return (not envs.VLLM_DISABLE_FLASHINFER_PREFILL and flashinfer_available
and not envs.VLLM_USE_CUDNN_PREFILL
and current_platform.is_device_capability(100))


Expand Down