I can confirm it. At the moment the kernel module is not patched and you need to install the package zfs-dkms.
without patch: WRITE SPEED 25,3 MB/s READ SPEED 52,6 MB/s
with patch (apt install zfs-dkms && reboot): WRITE SPEED 173 MB/s READ SPEED 230 MB/s
Ubuntu 20.04 LTS linux-image-5.4.0-40-generic (5.4.0-40.44) amd64 zfs-dkms (0.8.3-1ubuntu12.1) all
CPU: AMD Opteron(tm) X3216 APU zfs encryption: aes-256-gcm
I can confirm it. At the moment the kernel module is not patched and you need to install the package zfs-dkms.
without patch:
WRITE SPEED 25,3 MB/s
READ SPEED 52,6 MB/s
with patch (apt install zfs-dkms && reboot):
WRITE SPEED 173 MB/s
READ SPEED 230 MB/s
Ubuntu 20.04 LTS 5.4.0-40- generic (5.4.0-40.44) amd64
linux-image-
zfs-dkms (0.8.3-1ubuntu12.1) all
CPU: AMD Opteron(tm) X3216 APU
zfs encryption: aes-256-gcm