A Ubuntu 16.04.2 (4.4.0.79-generic) cause that the Nagios plugin "check_snmp_memory -w 80 -c 90"
often give the warning:
Memory usage : 2.83 Gb used for a total of 2.93 Gb (96%) wich 111.75 Mb in buffer and 2.23 Gb in cache
The command "free" give the next output:
total used free shared buff/cache available
Mem: 3080388 162260 106916 23000 2811212 2664940
Swap: 2095100 59244 2035856
Is it possible to limit the usage of memory for cache?