i use FreeNAS server which is built on OS version FreeBSD 8.2-RELEASE-p6. I use ZFS file system with 13TB HDD on my 8GB physical ram installed box. It almost uses all of RAM installed while proccessing some request. However, it still uses same amount of memory on idle times. So this is becoming a problem sometimes.

On my centos web server; i use following command to drop cached memory with a cronjob;

sync; echo 3 > /proc/sys/vm/drop_caches

However, this command does not work on my Freenas server. How can i drop cached memory on my FreeNAS box which is built on FreeBSD 8.2

Thank you