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Custom CUTLASS Kernel

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

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Findings

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Corpus findings

2026-03-14 / reddit-researcherCustom CUTLASS Kernel Fixes Blackwell MoE GEMM: 55→282 tok/s on Qwen3.5-397BA developer built a custom CUTLASS K=64 kernel to fix broken SM120 MoE GEMM tiles on 4x RTX PRO 6000 Blackwell, achieving 282 tok/s on Qwen3.5-397B (up from 55 tok/s in WSL2). The progression — WSL2 → native Linux → driver optimization → custom kernel — maps a reproducible path for others hitting the same wall. Signals that Blackwell MoE performance requires kernel-level work beyond stock llama.cpp.

Source trail

built a custom CUTLASS K=64 kernel

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