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Chris LuandGitHub
da4f06ec12
* Give the local Unix socket gRPC transport room to breathe Unix socket buffers default small and never autotune: 208KB on Linux, 8KB on macOS. Once the buffer cannot absorb what gRPC's loopyWriter emits for the in-flight streams the writer blocks on Write, and since v1.82.1 grpc-go counts per-RPC bookkeeping toward its control-buffer throttle, so both peers stop reading and the connection deadlocks for good. weed mini wedged at roughly 320 concurrent S3 PUTs with every filer RPC parked in waitOnHeader and no handler running. Force 8MB on both ends of the sockets we open. Best effort, since a kernel may clamp it lower; that only lowers the concurrency this survives. TCP loopback never hit this because its buffers start large and grow. * Set the buffer on accepted connections too Linux does not carry the listener's SO_SNDBUF onto sockets returned by accept, so only the dialing half was getting the headroom: measured 8388608 on the dialed side against the 212992 default on the accepted side. Wrap the listener and re-apply per connection. macOS inherits either way, which is why this did not show up locally.