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cnst
Asked: 2013-02-08 16:34:06 +0800 CST

How to reduce the timeout for TIME_WAIT connections on OpenBSD?

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I'm running http_load on OpenBSD 5.2, to test how good my nginx setup is, and I've noticed that cold runs are much faster than warm runs, and with every run the performance goes down very dramatically (e.g. from 3735 replies per second on a cold run, to 2288, 1804, 1553 on subsequent runs).

I've noticed with netstat -n | wc -l that there are several thousand connections after running http_load, most of which are in the (state) of TIME_WAIT.

It might seem like set timeout tcp.finwait 8 for pf.conf would reduce some timeout value from 45s to 8s, but it doesn't seem to affect these TIME_WAIT connections at all, which still stay in netstat -n for exactly 60s from the time they're created through http_load / nginx.

Is there a way to expire these TIME_WAIT connections much sooner than 60s?

tcp

1 Answers

  1. You can play with these sysctl variables:

    /etc/sysctl.conf

    net.inet.tcp.keepinittime = 150
net.inet.tcp.keepidle = 14400
net.inet.tcp.keepintvl = 150
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