Public bug reported:
Since OpenZFS the reception of incremental backups over ssh are very slow;
FreeBSD 13.0 with OpenZFS running on a 2003 Pentium 4 HT 3.0GHz (1.5GB DDR) is
faster than Ubuntu 21.10/22.04 with OpenZFS running on my laptop with an
i5-2520m (8GB DDR3).
FreeBSD runs at 21 MiB/s with a 10% variance; The limit is caused by the load
on a P4 CPU thread of >90%;
For Ubuntu the transfer speed is between 90 MiB/S and periods of seconds long
with 0 MiB/s. A lot of time the transfer speed is in the single digit numbers.
The problems occur when one or two of the four i5 cpu threads run at
100%, while the CPU clock remains at 0.83 GHz. So it looks like an
integration issue between OpenZFS and the Linux kernel.
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: zfsutils-linux 2.1.2-1ubuntu3
ProcVersionSignature: Ubuntu 5.15.0-25.25-generic 5.15.30
Uname: Linux 5.15.0-25-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu82
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 16 14:49:10 2022
InstallationDate: Installed on 2021-10-30 (168 days ago)
InstallationMedia: Ubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
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']
** Affects: zfs-linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug jammy
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https://bugs.launchpad.net/bugs/1969281
Title:
Very slow reception of incremental OpenZFS backup
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