Re: Adding file swap on btrfs

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On 12/19/22 12:13, Richard Shaw wrote:
On Mon, Dec 19, 2022 at 2:10 PM Samuel Sieb <samuel@xxxxxxxx <mailto:samuel@xxxxxxxx>> wrote:

    On 12/19/22 11:58, Neal Becker 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?

    Something is wrong with how it creates the swap format.  Just run
    "mkswap /swapfile" and it will be fine.


Not quite, without the chattr +C it will still perform COW file operations which you don't want on large files.

It's still the same device that was created by the btrfs tool. I just ran the mkswap formatting tool to fix the swap size.
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