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[release/2026930][Backport #40541] [NPU] Avoid FP8 dispatch for INT8 MoE on A5 #1307

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Merged
Hexq0210 merged 1 commit into from
Oct 9, 2026
Merged

[release/2026930][Backport #40541] [NPU] Avoid FP8 dispatch for INT8 MoE on A5 #1307

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9 changes: 9 additions & 0 deletions python/sglang/srt/layers/moe/token_dispatcher/deepep.py
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Original file line number Diff line number Diff line change
Expand Up @@ -490,6 +490,15 @@ def set_deepep_dispatcher_dtype(self) -> None:
self.use_mxfp8 = config["use_mxfp8"]
self.use_nvfp4 = config["use_nvfp4"]

if _is_npu and self.deepep_output_dtype == DispatcherOutputDtype.INT8:
from sglang.srt.hardware_backend.npu.utils import is_npu_arch35

if is_npu_arch35():
# DeepEP interprets use_fp8=True as FP8 on A5, not INT8.
# Allow the normal-mode INT8 env fallback, or dispatch BF16
# and let the existing MoE kernel quantize it to INT8.
self.use_fp8 = False

# Handle environment variables
if _is_npu:
self._update_int8_quant_env()
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