Function ssm_rowwise_w_bf16_bytes 

pub fn ssm_rowwise_w_bf16_bytes(config: &ModelConfig) -> usize

2026-09-25: Slab bytes: the per-layer pair times num_ssm_layers, or 0 unless METRALE_FP8_ROWWISE=1. The predicate is the one in the loader’s rowwise_fp8_enabled (weight_loader/qwen35_dense/rowwise_fp8.rs): the loader installs the row-wise weights on it and the arms then need this slab, so the two must agree.