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It was only used to protect the list which is now an mt_list so it doesn't provide any required protection anymore. It obviously also used to provide strict ordering between the writer and the reader when the writer started to update the messages, but that's now covered by the oredered tail updates and updates to the readers count to protect the area. The message rate on small thread counts (up to 12) saw a boost of roughly 5% while on large counts while for large counts it lost about 2% due to some contention now becoming visible elsewhere. Typical measures are 6.13M -> 6.61M at 3C6T, and 1.88 -> 1.92M at 24C48T on the EPYC.