Building a 3FS controller with RDMA: a dev on why the filesystem 'is screaming fast'
sloppenheimer · x · 2026-09-24
A developer praises 3FS (DeepSeek's open-source distributed filesystem) after writing a controller for it, saying pairing it with RDMA transfer instead of regular network paths makes it "screaming fast". Next they want to try overlaybd and erofs. They also note the hidden complexity of the CSI/OCI filesystem support matrix across VM products — firecracker, cloud hypervisor, microvm.nix, qemu, lima — arguing unifying that matrix matters more than any single hypervisor choice.
Related event: Dev Builds RDMA Controller for DeepSeek 3FS, Eyes Forkable Sandboxes(2 posts)→
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