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Qwen 3.5 Needs bf16 KV Cache

Qwen 3.5 models like 35B A3B require bf16 KV cache in llama.cpp for accurate perplexity, not default f16. Tests show bf16 PPL at 6.5497 vs 6.5511 for f16/f32. vLLM defaults to bf16 correctly, but llama.cpp needs manual flags.

Reddit r/LocalLLaMACommunityMar 2#kv-cache#quantization#perplexity