Modified version of check_snmp_mem.pl, from http://sourceforge.net/projects/nagios-snmp/, that does not take into account memory used by buffer on Net-SNMP devices. Values returned are more consistent with "-/+ buffers/cache" output line from "free" command.

I made this fork because I had servers with a lot of RAM used in buffers, and this triggered frequently Shinken alerts while I was far below desired memory level threshold.