Gönderen man :mkswap
Note that a swap file must not contain any holes. Using cp(1) to
create the file is not acceptable. Neither is use of fallocate(1) on
file systems that support preallocated files, such as XFS or ext4, or
on copy-on-write filesystems like btrfs. It is recommended to use
dd(1) and /dev/zero in these cases. Please read notes from swapon(8)
before adding a swap file to copy-on-write filesystems.
Ve aralarından man :swapon
You should not use swapon on a file with holes. This can be seen in
the system log as
swapon: swapfile has holes.
The swap file implementation in the kernel expects to be able to write
to the file directly, without the assistance of the filesystem. This
is a problem on preallocated files (e.g. fallocate(1)) on filesystems
like XFS or ext4, and on copy-on-write filesystems like btrfs.
Bundan fallocate
daha hızlı olsa da dd
, takas dosyaları oluşturmak için uygun olmadığı ve takasla ilgili araçlar tarafından desteklenmediği anlaşılmaktadır .
fallocate
genellikle daha hızlıdır (oluşturulan dosyayı sıfırlarla doldurmadığından) - aksi halde hiçbir fark yoktur, sonuç aynıdır. Bakınız: antipaucity.com/2017/08/31/…