Sometimes much worse results

[flaushi]

I am scheduling sysbench once a day on customer VMs (using cron) and report the results back to "me".

Now, sometimes, the performance is just much lower than other times, see this memory benchmark (sysbench memory run, or more precisely tps=$(sysbench memory run 2>/dev/null | awk -F '[ ()]' '$0 ~ /transferred/ {print $5}'))

(every measurement is one day)

This is a result for the cpu benchmark:

Would you say this must be a problem with the virtual machine?