TL;DR: Do not enable net.ipv4.tcp_tw_recycle.
The Linux kernel documentation is not very helpful about what net.ipv4.tcp_tw_recycle does:
Enable fast recycling TIME-WAIT sockets. Default value is 0. It should not be changed without advice/request of technical experts.
Its sibling, net.ipv4.tcp_tw_reuse is a little bit more documented but the language is about the same:
Allow to reuse TIME-WAIT sockets for new connections when it is safe from protocol viewpoint. Default value is 0. It should not be changed without advice/request of technical experts.
The mere result of this lack of document
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