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[BugFix] Disable fp8 kv-cache by default for DeepSeek V3.2 #27121

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Merged
merged 4 commits into from
Oct 18, 2025
Merged

[BugFix] Disable fp8 kv-cache by default for DeepSeek V3.2 #27121

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48a60a0
disable fp8 by default for DSv32
LucasWilkinson Oct 17, 2025
2fcd2f9
Update vllm/model_executor/models/config.py
LucasWilkinson Oct 17, 2025
ee85d86
fix indent
LucasWilkinson Oct 17, 2025
192e1f5
Merge branch 'main' into lwilkinson/no-fp8-default
LucasWilkinson Oct 18, 2025
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7 changes: 2 additions & 5 deletions vllm/model_executor/models/config.py
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Original file line number Diff line number Diff line change
Expand Up @@ -481,12 +481,9 @@ def verify_and_update_config(cls, vllm_config: "VllmConfig") -> None:
is_v32 = hasattr(hf_config, "index_topk")
assert is_v32

# For DeepSeekV3.2, we use a custom fp8 format as default (i.e.
# "auto")
# For DeepSeekV3.2, a custom fp8 format is used when fp8 kv-cache is enabled.
cache_config = vllm_config.cache_config
if cache_config.cache_dtype == "auto" or cache_config.cache_dtype.startswith(
"fp8"
):
if cache_config.cache_dtype.startswith("fp8"):
cache_config.cache_dtype = "fp8_ds_mla"
logger.info("Using custom fp8 kv-cache format for DeepSeekV3.2")
if cache_config.cache_dtype == "bfloat16":
Expand Down