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[DSA] Set trtllm kernels as default for Blackwell #21914

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Merged
Fridge003 merged 1 commit into from
Apr 2, 2026
+2 −7
Merged

[DSA] Set trtllm kernels as default for Blackwell #21914

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9 changes: 2 additions & 7 deletions python/sglang/srt/server_args.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1411,15 +1411,10 @@ def _set_default_nsa_kv_cache_dtype(self, major: int, quantization: str) -> str:
)

if self.kv_cache_dtype == "auto":
# TODO: Temporarily set default dtype on B200 as bfloat16 to avoid performance regression.
# TODO: Remove this after the performance regression is fixed. (Ref: https://github.com/sgl-project/sglang/issues/21291)
if quantization == "modelopt_fp4" and major >= 10 and self.dp_size > 1:
if major >= 10:
self.kv_cache_dtype = "fp8_e4m3"
else:
self.kv_cache_dtype = "bfloat16"
# self.kv_cache_dtype = (
# "fp8_e4m3" if (major >= 10 and self.dp_size > 1) else "bfloat16"
# )
logger.warning(
f"Setting KV cache dtype to {self.kv_cache_dtype} for DeepSeek DSA on SM{major} device."
)
Expand Down Expand Up @@ -1450,7 +1445,7 @@ def _set_default_nsa_backends(self, kv_cache_dtype: str, major: int) -> str:
self.nsa_prefill_backend = "tilelang"
self.nsa_decode_backend = "tilelang"
elif kv_cache_dtype == "fp8_e4m3":
if self.dp_size == 1 and major >= 10:
if major >= 10:
self.nsa_prefill_backend = "trtllm"
self.nsa_decode_backend = "trtllm"
else:
Expand Down
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