zramctl showing incorrect values

I have setup a

with the

-generator

package on a Manjaro (stable) install. I don't have any other swap configured. When I run the

command, the given values are significantly lower than what swap uses (see command outputs below).

, where

is the size of the uncompressed data on the ramdisk,

is the compressed data and

is the current size of the ramdisk:

$ zramctl 
NAME       ALGORITHM DISKSIZE  DATA COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram0 zstd         31,3G 10,2G  3,2G  3,4G      12 [SWAP]

Output of

:

$ swapon
NAME       TYPE       SIZE  USED PRIO
/dev/zram0 partition 31,3G 14,8G  100

And output of

(it's also interesting that it cuts off the decimal part on used, but not relevant here):

$ free -h
               total        used        free      shared  buff/cache   available
Mem:            31Gi        24Gi       2,5Gi       314Mi       6,0Gi       6,4Gi
Swap:           31Gi        14Gi        16Gi

/proc/meminfo

contains some relevant info as well:

$ cat /proc/meminfo | grep swap
Zswap:            993724 kB
Zswapped:        4745548 kB

What is strange here is that if I subtract this

value from used swap, I get approximately the

report

value My question is - even though swapping seems to work fine - why is this the case? Is it a problem with

?