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fix: sync server_args.kv_cache_dtype when detecting FP8 KV cache #18394

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Merged
Fridge003 merged 1 commit into from
Feb 8, 2026
Merged

fix: sync server_args.kv_cache_dtype when detecting FP8 KV cache #18394

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13 changes: 13 additions & 0 deletions python/sglang/srt/model_executor/model_runner.py
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Original file line number Diff line number Diff line change
Expand Up @@ -213,6 +213,13 @@
"trtllm_mla",
]

TORCH_DTYPE_TO_KV_CACHE_STR = {
torch.float8_e4m3fn: "fp8_e4m3",
torch.float8_e4m3fnuz: "fp8_e4m3",
torch.float8_e5m2: "fp8_e5m2",
torch.bfloat16: "bf16",
}


def add_mla_attention_backend(backend_name):
if backend_name not in MLA_ATTENTION_BACKENDS:
Expand Down Expand Up @@ -1573,8 +1580,14 @@ def configure_kv_cache_dtype(self):
):
if _is_hip:
self.kv_cache_dtype = fp8_dtype
self.server_args.kv_cache_dtype = TORCH_DTYPE_TO_KV_CACHE_STR[
self.kv_cache_dtype
]
else:
self.kv_cache_dtype = torch.float8_e4m3fn
self.server_args.kv_cache_dtype = TORCH_DTYPE_TO_KV_CACHE_STR[
self.kv_cache_dtype
]
else:
self.kv_cache_dtype = self.dtype
elif self.server_args.kv_cache_dtype == "fp8_e5m2":
Expand Down
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