Infiniband on Bits-Entangledhttps://stondo.github.io/tags/infiniband/Recent content in Infiniband on Bits-EntangledHugo -- 0.157.0en-usMon, 23 Feb 2026 00:00:00 +0000Why nvidia_peermem Fails on DGX Spark: a Deep Dive into GPUDirect RDMA, Secure Boot, and Unified Memoryhttps://stondo.github.io/posts/nvidia-peermem-gpudirect-rdma-dgx-spark/Mon, 23 Feb 2026 00:00:00 +0000https://stondo.github.io/posts/nvidia-peermem-gpudirect-rdma-dgx-spark/A detailed investigation into why nvidia_peermem refuses to load on HP ZGX Nano G1n (DGX Spark) systems, covering Secure Boot module signing, kernel source code analysis, the fundamental hardware limitation that makes GPUDirect RDMA impossible on DGX Spark / GB10 SoC, and the PCIe Gen5 x4 bandwidth bottleneck on the ConnectX-7 NICs.