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fanyang
f24735a86f
* bench: add packet bytes extraction Criterion benchmark Adds a Criterion benchmark under easytier/benches/ covering ZCPacket::payload_bytes and tunnel_payload_bytes at 1280/4096-byte payload sizes, using iter_batched so ZCPacket construction stays in the setup phase and is excluded from the timed region. - Register the [[bench]] entry in easytier/Cargo.toml. - Document the bench and PACKET_BYTES_* env vars in benches/README.md. * perf: reduce packet buffer slicing churn Replace BytesMut::split_off with Buf::advance in ZCPacket bytes extraction paths (payload_bytes, tunnel_payload_bytes, convert_type, drop_foreign_header) and in TunZCPacketToBytes, and simplify the copy_from_slice in new_from_payload. When the buffer is in its unique (VEC) representation, split_off promotes it to the shared (ARC) representation, allocating a Shared control block and bumping the refcount on every call, and pins the buffer in shared mode. advance only mutates the in-place ptr/len/cap fields, avoiding that allocation/refcount churn on the TX hot path. The byte data itself is not copied by either path.