I am writing a network application that mirrors a given website (such as a suped-up "wget"). I use a lot of FDs, and was getting connect() errors when I would run out of local_ip:local_port tuples. I lowered the MSL so that TIME_WAIT would timeout very quick (yes, I know, this is "bad", but I'm going for sheer speed here), and it alleviated the problem a bit.
However, I have run into a new problem. I am getting a good amount of blocks stuck in FIN_WAIT_1, FIN_WAIT_2 or LAST_ACK that stick around for a long while. I have been unable to find must information on a timeout for these states. I came across a small patch that modified tcp_timer.c in /usr/src/sys/netinet. It changed line #484 (in FreeBSD 4.9-REL) from:
if (tp->t_state != TCPS_TIME_WAIT &&
to
if (tp->t_state < FIN_WAIT_2 &&
I also tried changing that to ".. <= FIN_WAIT_2 .."
However, I still end up with quite a few stuck in FIN_WAIT_1, FIN_WAIT_2 or LAST_ACK after the program exits (and whilst the program is running of course). They don't seem to timeout in the same interval that TIME_WAIT does.
Any ideas? Did I modify the right piece of code? I was told to post here as you all would more than likely know!
I am stumped.
Thank you all in advance,
Brandon
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