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-gen
I was also affected in bionic (linux-image-5.3.0-62-generic), but (since
today?) there is an update available: linux-image-5.4.0-42-generic
(5.4.0-42.46~18.04.1)
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