A production investigation of DeepSeek V4.1 disk-backed Engram on four DGX Sparks: how syscall, page-cache, and component profiling found a Python scheduling bottleneck, how RWF_NOWAIT fixed it, and what the production evidence does and does not prove.
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A complete experiment report on running Qwen 27B with TP2 and native speculative decoding across two RTX 5090 hosts, finding a Thunderbolt transport bottleneck, and validating an opt-in Linux TX-E2E fix.