Vol. I · No. 124FRI, AUG 21, 2026
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Follow-up: Trying to make NVIDIA GPUs plug-and-play on Macs. Found hidden RDMA symbols Apple doesn't want you to see — zero-copy GPU memory sharing might already work.

**TL;DR:** My last post about testing TinyGPU attracted some interest. This is the follow-up. The Blackwell card is detected and the driver loads, but NVIDIA's GSP firmware fails to boot through TB5 (known issue, I'm working with tinygrad on it). While debugging that, I went down a rabbit hole and discovered that Apple's RDMA subsystem accepts Metal GPU buffers for zero-copy network transfers — something nobody has documented. I also found hidden `ibv_reg_dmabuf_mr` symbols in Apple's libibverbs that suggest GPUDirect RDMA might be possible on macOS without any kernel modification. Here's eve...

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I paused, went to eat, took shower, 1 prompt later, 45% (8 mins into a new session)

I was working on a project, I got hungry went to eat and take a shower while also having this be my break, came back, session was at 0%, typed to claude that the animation of the CSS needs to be slower and more subtle, he changed it, 45% usage. Nowhere did it warn me that possibly cache was cold or that I would be consuming a lot of tokens to CONTINUE a chat that I didn't close on the same PC. So now I have to slow down my work and wait for this 5 hour cycle to end to properly speed up my progress.

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