I show you a screenshot of the moment the tranfer stalls ** Attachment removed: "Screenshot from 2022-02-19 19-55-54.png" https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1961499/+attachment/5562212/+files/Screenshot%20from%202022-02-19%2019-55-54.png
** Attachment added: "Screenshot from 2022-02-19 20-33-01.png" https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1961499/+attachment/5562213/+files/Screenshot%20from%202022-02-19%2020-33-01.png -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to zfs-linux in Ubuntu. https://bugs.launchpad.net/bugs/1961499 Title: Backup ZFS extremely slow. Status in zfs-linux package in Ubuntu: New Bug description: I weekly backup my stuff to a Pentium 4 HT on FreeBSD 13.0 and to This i5-2520M. FreeBSD on the Pentium is faster than Ubuntu 21.10 on the i5; The Pentium runs constantly at a ~92% CPU load on one thread and it succeeds in transferring the stuff at ~22Mbps. The I5 is slower and sometimes transfers at 80Mbps, but it also stops transferring for many seconds. When it stops transferring one of the CPU threads has a 100% load according to the load measurement of Conky. If I look with the task-manager the load is normal and in the expected range and it never exceeds for any thread more than 70%. All zfs datasets are lz4 compressed on all 3 sides and I use the same send and receive command only the dataset names are different :) The send command is used with the -c parameter. The same situation worked fine with ZFS 0.8. I have the unhappy feeling that the 100% load on one thread is maybe caused by emulation of an instruction not supported by the i5 and that is why conky measures it and the task-manager not. I hope you can find it or maybe 2.1.2 is better, otherwise I might have to move the i5 to FreeBSD too :) :( Here I use a modern 2TB HDD and on the Pentium 4 HDDs in two pools; one with 2 x 3.5"IDE and th other with 2 x 2.5" SATA-1. ProblemType: Bug DistroRelease: Ubuntu 21.10 Package: zfsutils-linux 2.0.6-1ubuntu2.1 ProcVersionSignature: Ubuntu 5.13.0-28.31-generic 5.13.19 Uname: Linux 5.13.0-28-generic x86_64 NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair ApportVersion: 2.20.11-0ubuntu71 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Sat Feb 19 19:16:53 2022 InstallationDate: Installed on 2021-10-30 (112 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'] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1961499/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
