"snmp" displays incorrect or negative memory values on monitoring software

Solution Verified - Updated -

Issue

  • When using various software to view memory values provided by "snmp", incorrect or negative values are shown.

  • An example of this is when a monitoring application uses the following calculations:

RealFree = memTotalFree + memBuffer + memCached
RealUsed = memTotalReal - RealFree

  • Due to incorrect memory calculations reported by "snmp" (which can be checked with snmpbulkwalk -v2c -c XXX 127.0.0.1 .1.3.6.1.4.1.2021.4) , RealFree gets reported as greater than memTotalReal. This causes RealUsed to become a negative number, resulting in the application displaying the negative number or an invalid value.

  • Also memTotalFree is reported as greater than memTotalReal, which should not be possible.

Environment

  • Red Hat Enterprise Linux (RHEL) 7.7
  • net-snmp-5.7.2-43.el7.x86_64

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