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@SemiAnalysis_: TRUTH SOCIAL: NVLink multicast is not supported on Blackwell "Confidential Computing" leading to 61% performance regression on SGLang Qwen3....

@SemiAnalysis_ 3 信息等级 3 1 噪音/剔除；2 较弱；3 普通事实；4 重要行业动态；5 极重大事件。该分数是信息显著性，不是投资建议。 发布：2026-05-30T00:00 抓取：2026-05-30 05:19
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摘要

Twitter用户指出，NVIDIA Blackwell GPU在机密计算模式下不支持NVLink multicast，导致SGLang Qwen3.5模型性能下降61%。同时，Hopper的机密计算也被曝NVLink未加密。

客观事实
  • Blackwell机密计算不支持NVLink multicast，Qwen3.5性能降61%
  • Hopper机密计算中NVLink未加密（据NVIDIA白皮书）
NVIDIA Blackwell Hopper SGLang Qwen3.5 Verdacloud GitHub

原文

TRUTH SOCIAL: NVLink multicast is not supported on Blackwell "Confidential Computing" leading to 61% performance regression on SGLang Qwen3.5 397B according to @verdacloud 's recent github ticket. NVIDIA's  "Confidential Computing" is complete slop as in addition Hopper's  confidential computing had fully unencrypted NVLink according to NVIDIA's own "NVIDIA Secure AI with Blackwell and Hopper GPUs" Whitepaper.

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