On 07/27/2018 08:10 AM, Bowie Bailey wrote:
The problem is that I can't find 2.4G of usage.


Are your results from "top" similar to:

  ps axu | sort -nr -k +6

If you don't see 2.4G of use from applications, maybe the kernel is using a lot of memory.  Check /proc/slabinfo.  You can simplify its content to bytes per object type and a total:

  grep -v ^# /proc/slabinfo | awk 'BEGIN {t=0;} {print $1 " " ($3 * $4); t=t+($3 * $4)} END {print "total " t/(1024 * 1024) " MB";}' | column -t

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