Timewait reuse autotuning#238
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Usually net.ipv4.tcp_tw_reuse is set to 2 (reuse TCP timewait sockets for loopback); if we approach limit of outbound ephemeral port exhaustion (timewait_sockets + active_established_sockets approaches port range) set tcp_tw_reuse = 1. Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Add tests that reduce the TCP ephemeral port range and then trigger enough outbound connections to cause bpftune to notice approaching ephemeral port exhuastion; ensure it enables tcp_tw_reuse. Test for global and non-global netns, and test in legacy mode. Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
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tcp_conn_tuner: auto-tune TCP timewait reuse (net.ipv4.tcp_tw_reuse)
Usually net.ipv4.tcp_tw_reuse is set to 2 (reuse TCP timewait sockets for loopback); if we approach limit of outbound ephemeral port exhaustion (timewait_sockets + active_established_sockets approaches port range), set tcp_tw_reuse = 1.
Add tests and document new tcp_conn_tuner behaviour.