Yusheng Zheng https://www.yunwei37.com/blog Yusheng Zheng is a systems researcher working on GPU runtimes, distributed AI infrastructure, programmable systems, and agent observability. en-us yunwei356@gmail.com (Yusheng Zheng) yunwei356@gmail.com (Yusheng Zheng) Fri, 18 Sep 2026 15:00:00 GMT https://www.yunwei37.com/blog/qwen-tp2-nextn-thunderbolt-tx-e2e Two RTX 5090s, One Qwen Model, and a Thunderbolt Flow-Control Bug https://www.yunwei37.com/blog/qwen-tp2-nextn-thunderbolt-tx-e2e 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. Fri, 18 Sep 2026 15:00:00 GMT yunwei356@gmail.com (Yusheng Zheng) llm-inferencegpulinuxthunderboltsystems