vnodeの不足でvlruwk stateになることがあった。
systat -vmstat
number of vnodes actually allocated (`numvn'),
and number of allocated vnodes that are free (`frevn').
Suddenly slow lstat syscalls on CURRENT from Juli
https://www.freebsd.org/doc/en/books/handbook/configtuning-kernel-limits.html
To increase performance, you may increase kern.maxvnodes (in /etc/sysctl.conf) way up if you have the RAM for it (e.g. 400000 for a 2GB system).
# Every socket is a file, so increase them kern.maxfiles=204800 kern.maxfilesperproc=200000 kern.maxvnodes=200000
512GB
kern.maxvnodes: 8222162
freebsd-performance - vm.kmem_size_max and vm.kmem_size capped at 329853485875 (~307GB)
nagios監視
http://exchange.nagios.org/directory/Plugins/Operating-Systems/Linux/check_sysctl/details
その他、参考
https://www.stalker.com/CommuniGatePro/Scalability.html
how big can kern.maxvnodes get?
https://www.ixsystems.com/community/threads/lost-access-to-freenas-when-transfer-large-files.4730/
