I have 4.3, and soon to be 4.4, boxes dedicated to a single app which
basically 'bounces' traffic between two incoming TCP connections. After
around 240 sessions (each session consisting of two incoming connections
with traffic being passed between them), I started getting ENOBUFS
errors. netstat -m showed mbuf's never peaked, so we increased
kern.ipc.somaxconn from 128 -> 256. Should this help the problem?
Any other guidelines to help tune a FreeBSD box for this sort of use
would be greatly appreciated. Currently, the only change we make is
increasing MAXUSERS to 128, though I'm not sure this is the preferred
approach.
Also, is there a definitive guide to what all the kernel variables
(sysctl -a) are?
thanks
Jeff
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