I just installed the linux-generic kernel from focal-proposed
(5.4.0-12-generic) built 1/21/2020@15:12:29.  It still included zfs-kmod
version was still 0.8.2-3ubuntu4.  After installing zfs-dkms, kmod
version was bumped 0.8.2-3ubuntu5.  Fletcher_4_bench performance
increased 2.7827x (3.3294 biteswap).

I don't know the ubuntu kernel build/release process.  When does
0.8.2-3ubuntu5 get included into the kernel itself?

(BTW.... upstream 0.8.3 was released yesterday 1/23/2020.
0.8.2-3ubuntu5 will likely be old anyway)

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https://bugs.launchpad.net/bugs/1857040

Title:
  zfs: upstream support for hardware-accelerated encryption

Status in linux package in Ubuntu:
  In Progress
Status in zfs-linux package in Ubuntu:
  Fix Released

Bug description:
  I understand that in Linux 5.0+, certain encryption-related symbols
  have been marked GPL-only, making them unavailable for use by zfs.  As
  a result, using encryption in zfs pools increases cpu load / decreases
  disk throughput.

  There are a pair of upstream pull requests that should improve the
  performance (with performance measurement done on x86-64).  Can these
  be pulled into the Ubuntu kernel?

  https://github.com/zfsonlinux/zfs/pull/9515
  https://github.com/zfsonlinux/zfs/pull/9296

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