[Bug 287872] boot time regression related to netlink and devd

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287872

--- Comment #2 from Eugene Grosbein <[email protected]> ---
Also, I observe bad performance of the command ifconfig while the host has 814
network interfaces in total, including vlans:

# time ifconfig -l > /dev/null

real    0m0,836s
user    0m0,001s
sys     0m0,001s

# time ifconfig lo0 > /dev/null

real    0m0,840s
user    0m0,000s
sys     0m0,008s

ifconfig does many netlink calls:

# kdump -Ep 15771 | fgrep -c AF_NETLINK
165

devd runs many extra scripts and I suspect O(N^2) or even O(N^3) complexity of
devd starting sequence where N is total amount of vlans created before devd
starts.

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