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2d6b5c7a60
Previously the conn_hash_node was placed outside the connection due to the big size of the eb64_node that could have negatively impacted frontend connections. But having it outside also means that one extra allocation is needed for each backend connection, and that one memory indirection is needed for each lookup. With the compact trees, the tree node is smaller (16 bytes vs 40) so the overhead is much lower. By integrating it into the connection, We're also eliminating one pointer from the connection to the hash node and one pointer from the hash node to the connection (in addition to the extra object bookkeeping). This results in saving at least 24 bytes per total backend connection, and only inflates connections by 16 bytes (from 240 to 256), which is a reasonable compromise. Tests on a 64-core EPYC show a 2.4% increase in the request rate (from 2.08 to 2.13 Mrps).