Some information is described here http://lists.freebsd.org/pipermail/freebsd-fs/2011-October/012878.html. However two of my hosts with swapfile="/usr/swap0" in /etc/rc.conf, where /usr/swap0 is created by dd (official handbook way), perfectly hang without swapoff, through N time of the beginning of use swap Fix: Sorry How-To-Repeat: 1) dd if=/dev/zero of=/usr/swap0 bs=1024k count=512 2) swapfile="/usr/swap0" to /etc/rc.conf 3) service addswap start start to use a swap, or play with swapoff/on command like this: http://lists.freebsd.org/pipermail/freebsd-fs/2011-October/012878.html
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