FreeNAS not using all installed RAM

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http://serverfault.com – I have just installed FreeNAS 7.3 in an Alix.2 board with 256 MB physical RAM on-board. Nothing configured, nor hard disks attached. The problem is the OS is only using 51MB of that amount. The graph of the status page says that: Memory usage: 78% of 51MiB The output of sysctl confirms the previous value: hw.physmem: 53604352 hw.usermem: 35471360 hw.realmem: 268435456 And is consistent whith data in /var/run/dmesg.boot (this one drifted a little bit): real memory = 268435456 (256 MB) avail memory = 47779840 (45 MB) How can I tell FreeNAS to use all available 256MB? Or what can be wr (HowTos)