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[Bugfix] Fix marlin 2:4 kernel crash on H100 #243
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The reason for the crash was the inline PTX assembly that introduced the async_copy with streaming behavior. The solution is to use the more standard PTX for async_copy (without the fractional L2 policy for "evict_first"). There is no performance difference between standard async_copy PTX and the previous one.
Ported from dense marlin: vllm-project#4218