private function _memoryadditional()
    {
        $pagesize = $this->grabkey("hw.pagesize");
        $this->sys->setMemCache($this->grabkey("vm.stats.vm.v_cache_count") * $pagesize);
        $this->sys->setMemApplication(($this->grabkey("vm.stats.vm.v_active_count") + $this->grabkey("vm.stats.vm.v_wire_count")) * $pagesize);
        $this->sys->setMemBuffer($this->sys->getMemUsed() - $this->sys->getMemApplication() - $this->sys->getMemCache());
    }