A swapfile on ZFS is a bad idea. Swapped out pages get pushed through the vfs into zfs and each page of swap will be magnified in the number of free pages required to get this page out to disk.
-- 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/1847628 Title: When using swap in ZFS, system stops when you start using swap Status in zfs-linux package in Ubuntu: New Bug description: # Problem When using swap in ZFS, system stops when you start using swap. > stress --vm 100 if you doing swapoff will only occur OOM and the system will not stop. # Environment jehos@MacBuntu:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu Eoan Ermine (development branch) Release: 19.10 Codename: eoan jehos@MacBuntu:~$ dpkg -l | grep zfs ii libzfs2linux 0.8.1-1ubuntu13 amd64 OpenZFS filesystem library for Linux ii zfs-initramfs 0.8.1-1ubuntu13 amd64 OpenZFS root filesystem capabilities for Linux - initramfs ii zfs-zed 0.8.1-1ubuntu13 amd64 OpenZFS Event Daemon ii zfsutils-linux 0.8.1-1ubuntu13 amd64 command-line tools to manage OpenZFS filesystems jehos@MacBuntu:~$ uname -a Linux MacBuntu 5.3.0-13-generic #14-Ubuntu SMP Tue Sep 24 02:46:08 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux jehos@MacBuntu:~$ zpool list NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT bpool 1.88G 66.1M 1.81G - - - 3% 1.00x ONLINE - rpool 230G 124G 106G - - 9% 53% 1.00x ONLINE - jehos@MacBuntu:~$ zfs get all rpool/swap NAME PROPERTY VALUE SOURCE rpool/swap type volume - rpool/swap creation 목 10월 10 15:56 2019 - rpool/swap used 2.13G - rpool/swap available 98.9G - rpool/swap referenced 72K - rpool/swap compressratio 1.11x - rpool/swap reservation none default rpool/swap volsize 2G local rpool/swap volblocksize 4K - rpool/swap checksum on default rpool/swap compression zle local rpool/swap readonly off default rpool/swap createtxg 34 - rpool/swap copies 1 default rpool/swap refreservation 2.13G local rpool/swap guid 18209330213704683244 - rpool/swap primarycache metadata local rpool/swap secondarycache none local rpool/swap usedbysnapshots 0B - rpool/swap usedbydataset 72K - rpool/swap usedbychildren 0B - rpool/swap usedbyrefreservation 2.13G - rpool/swap logbias throughput local rpool/swap objsetid 393 - rpool/swap dedup off default rpool/swap mlslabel none default rpool/swap sync always local rpool/swap refcompressratio 1.11x - rpool/swap written 72K - rpool/swap logicalused 40K - rpool/swap logicalreferenced 40K - rpool/swap volmode default default rpool/swap snapshot_limit none default rpool/swap snapshot_count none default rpool/swap snapdev hidden default rpool/swap context none default rpool/swap fscontext none default rpool/swap defcontext none default rpool/swap rootcontext none default rpool/swap redundant_metadata all default rpool/swap encryption off default rpool/swap keylocation none default rpool/swap keyformat none default rpool/swap pbkdf2iters 0 default To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1847628/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
