Short answer: yes, it is normal and you don't need to worry about it.
Long answer: linux does use some swap even if enough memory is available. The rationale is that caching recently read/written data can be more useful than keeping old, inactive program code & data in RAM. This bias can be modified via the
swappiness sysctl tunable. From the kernel docs:
This control is used to define how aggressive the kernel will swap
memory pages. Higher values will increase aggressiveness, lower
values decrease the amount of swap. A value of 0 instructs the kernel
not to initiate swap until the amount of free and file-backed pages is
less than the high water mark in a zone.
The default value is 60.
If you really want to reduce swapping, you can lower the
swappiness value via
sysctl vm.swappiness=10 or
echo 10 > /proc/sys/vm/swappiness. Remember that this is valid until a reboot; to keep it between reboots, you need to edit the
If you wan to completely disable swap, you can use
swapoff -a (commenting the relevant
/etc/fstab entry to let it persist between reboots).