I did the same test for USB flash memory and it works normally.
try create a swap on zvol, it's definitely not working well..
===================================================================
jehos@MacBuntu:~$ sudo fdisk -l /dev/sdc
Disk /dev/sdc: 7.46 GiB, 8002732032 bytes, 15630336 sectors
Disk model: Cruzer Blade
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 91BE0613-2C00-8944-BEFF-12CCBF5DE2B8
jehos@MacBuntu:~$ sudo mkswap -f /dev/sdc
Setting up swapspace version 1, size = 7.5 GiB (8002727936 bytes)
no label, UUID=14bb8b5c-ded5-444e-8a62-a21cbc469d08
jehos@MacBuntu:~$ sudo swapon /dev/sdc
jehos@MacBuntu:~$ free -m
total used free shared buff/cache available
Mem: 7870 3106 3843 257 920 4260
Swap: 7631 0 7631
jehos@MacBuntu:~$ time stress --vm 100 -t 10
stress: info: [6247] dispatching hogs: 0 cpu, 0 io, 100 vm, 0 hdd
stress: info: [6247] successful run completed in 15s
real 0m15.124s
user 0m0.736s
sys 0m3.536s
--
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
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