Maybe I'm missing something here. I tested this out on an Eoan server:
$ dmesg | grep ZFS
[ 10.821332] ZFS: Loaded module v0.8.1-1ubuntu14.3, ZFS pool version 5000,
ZFS filesystem version 5
$ uname -a
Linux eaon-amd64 5.3.0-42-generic #34-Ubuntu SMP Fri Feb 28 05:49:40 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
I added a zfs_arc_max setting into the zfs.conf:
cat /etc/modprobe.d/zfs.conf
options zfs zfs_arc_max=50331648
rebooted and I get:
cat /sys/module/zfs/parameters/zfs_arc_max
50331648
So this is setting the L1ARC size as I expected. Can you explain further
the issue you are seeing?
** Changed in: zfs-linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: zfs-linux (Ubuntu)
Status: New => Incomplete
** Changed in: zfs-linux (Ubuntu)
Assignee: (unassigned) => Colin Ian King (colin-king)
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https://bugs.launchpad.net/bugs/1854480
Title:
zfs_arc_max not working anymore in zfs 0.8.1
Status in zfs-linux package in Ubuntu:
Incomplete
Bug description:
In the past I could limit the size of L1ARC by specifying "options zfs
zfs_arc_max=3221225472" in /etc/modprobe.d/zfs.conf. I tried even to
fill /sys/module/zfs/parameters/zfs_arc_max directly, but none of
those methods limits the size of L1ARC. It worked nicely in zfs 0.7.x.
Nowadays I use a nvme drive with 3400 MB/s read throughput and I see
not much difference between e.g booting the system from nvme and
rebooting the system from L1ARC. Having a 96-99% hit rate for the
L1ARC, I like to free up some memory, thus avoiding some delay of
freeing memory from L1ARC while loading a VM.
-------------------------------------------------------------------------
UPDATE:
The system only limits the L1ARC, if we directly after the login write
the zfs_arc_max value to the file
/sys/module/zfs/parameters/zfs_arc_max.
------------------------------------------------------------------------
ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: zfsutils-linux 0.8.1-1ubuntu14.1
ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
Uname: Linux 5.3.0-23-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 29 06:19:15 2019
InstallationDate: Installed on 2019-11-25 (3 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: zfs-linux
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.sudoers.d.zfs: [inaccessible: [Errno 13] Permission
denied: '/etc/sudoers.d/zfs']
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