On Dec 19, 2022, at 14:59, Neal Becker <ndbeck...@gmail.com> wrote:
> I've just installed f37 on a new lenovo x1 carbon.
> One thing, the installation didn't setup any swap (other than zswap).
>
> After a bit of reading I found
> sudo btrfs filesystem mkswapfile -s 32G /swapfile
> But:
> sudo swapon -v /swapfile
> swapon: /swapfile: found signature [pagesize=4096, signature=swap]
> swapon: /swapfile: pagesize=4096, swapsize=1073741824, devsize=34359738368
>
> Although I created 32G swapfile, only 1G is used.
> swapon
> NAME TYPE SIZE USED PRIO
> /dev/zram0 partition 8G 6.3M 100
> /swapfile file 1024M 0B -2
>
>
> What's wrong?
This is pretty much expected behavior.
Your zram swap device has a priority of 100, the swap file of -2.
See the swap(2) man page:
https://linux.die.net/man/2/swapon
Basically, you want to have swapped pages in the compressed memory device, it
is much faster and essentially is expanding available RAM. If memory pressure
gets high enough it will use your swap file, but unlikely unless your system is
really thrashing.
--
Jonathan Billings
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