Created attachment 177045 [details]
Please add more helpful description for sysctl net.inet.tcp.keepinit.
IMO, it is named "time to establish connection" because if we don't hear back within that time period when in state < TCPS_ESTABLISHED, we drop the connection.
JFYI and you may already know that.
Regarding the proposed patch, I have no opinion.
Thanks for your submission.