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Each worker has a receive buffer with space for 20 DNS messages of up to 2^16 bytes each, and the allocator function passed to uv_read_start() or uv_udp_recv_start() will reserve a portion of it for use by sockets. UDP can use recvmmsg() and so it needs that entire space, but TCP reads one message at a time. This commit introduces separate allocator functions for TCP and UDP setting different buffer size limits, so that libuv will provide the correct buffer sizes to each of them.