Public bug reported:

Good day.
I tried to make l2arc cache  persistent after reboot,
add option to /etc/modprobe.d/zfs.conf
options zfs zfs_arc_max=6294967296

 but after reboot:

dmesg
[  +0,011105] zfs: unknown parameter 'l2arc_rebuild_enabled' ignored


all modules?
 ls /sys/module/zfs/parameters/l2arc_
l2arc_feed_again      l2arc_feed_min_ms     l2arc_feed_secs       
l2arc_headroom        l2arc_headroom_boost  l2arc_noprefetch      l2arc_norw    
        l2arc_write_boost     l2arc_write_max 

 5.4.0-81-generic, ubuntu 20.04
zfs-linux - are correct bugreport package?

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: zfsutils-linux 0.8.3-1ubuntu12.12
ProcVersionSignature: Ubuntu 5.4.0-81.91-generic 5.4.128
Uname: Linux 5.4.0-81-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Fri Aug 20 20:39:14 2021
InstallationDate: Installed on 2019-12-28 (600 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: zfs-linux
UpgradeStatus: Upgraded to focal on 2020-04-23 (483 days ago)
modified.conffile..etc.sudoers.d.zfs: [inaccessible: [Errno 13] Отказано в 
доступе: '/etc/sudoers.d/zfs']

** Affects: zfs-linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal third-party-packages

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https://bugs.launchpad.net/bugs/1940703

Title:
  Ubuntu cannot find module "l2arc_rebuild_enabled"

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