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Date:      Mon, 24 Sep 2018 17:44:14 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 231457] Out of swap space on ZFS
Message-ID:  <bug-231457-227-S1sTOxDyQp@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-231457-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-231457-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D231457

Mike <mikeowens@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mikeowens@gmail.com

--- Comment #1 from Mike <mikeowens@gmail.com> ---
Experiencing same issue.

uname -a
FreeBSD sword 11.2-RELEASE-p3 FreeBSD 11.2-RELEASE-p3 #0: Thu Sep  6 07:14:=
16
UTC 2018     root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERI=
C=20
amd64

swapinfo -h
Device          1K-blocks     Used    Avail Capacity
/dev/da0p2       12582912     4.2M      12G     0%
/dev/da1p2       12582912     4.1M      12G     0%
Total            25165824     8.3M      24G     0%

sysctl hw | egrep 'hw.(phys|user|real)'
hw.physmem: 34297905152
hw.usermem: 1263333376
hw.realmem: 34359738368

tail /var/log/messages
Sep 24 12:30:29 sword kernel: pid 12993 (getty), uid 0, was killed: out of =
swap
space
Sep 24 12:30:43 sword kernel: pid 12994 (getty), uid 0, was killed: out of =
swap
space
Sep 24 12:30:58 sword kernel: pid 12995 (getty), uid 0, was killed: out of =
swap
space
Sep 24 12:31:14 sword kernel: pid 12996 (getty), uid 0, was killed: out of =
swap
space
Sep 24 12:31:28 sword kernel: pid 12997 (getty), uid 0, was killed: out of =
swap
space
Sep 24 12:31:42 sword kernel: pid 12998 (getty), uid 0, was killed: out of =
swap
space
Sep 24 12:31:57 sword kernel: pid 12999 (getty), uid 0, was killed: out of =
swap
space
Sep 24 12:32:12 sword kernel: pid 13000 (getty), uid 0, was killed: out of =
swap
space
Sep 24 12:32:27 sword kernel: pid 13001 (getty), uid 0, was killed: out of =
swap
space
Sep 24 12:32:42 sword kernel: pid 13002 (getty), uid 0, was killed: out of =
swap
spac

cat /boot/loader.conf

accf_data_load=3D"YES"
accf_http_load=3D"YES"
autoboot_delay=3D3
cc_htcp_load=3D"YES"
hw.igb.rx_abs_int_delay=3D1024
hw.igb.rx_int_delay=3D512
hw.igb.rxd=3D4096
hw.igb.tx_abs_int_delay=3D1024
hw.igb.tx_int_delay=3D512
hw.igb.txd=3D4096
hw.intr_storm_threshold=3D9000
if_bridge_load=3D"YES"
if_tap_load=3D"YES"
kern.geom.label.disk_ident.enable=3D"0"
kern.geom.label.gptid.enable=3D"0"
kern.ipc.nmbclusters=3D262144
kern.ipc.nmbjumbo16=3D32768
kern.ipc.nmbjumbo9=3D65536
kern.ipc.nmbjumbop=3D262144
kern.ipc.semaem=3D32767
kern.ipc.semmni=3D32767
kern.ipc.semmns=3D8192
kern.ipc.semmnu=3D4096
kern.ipc.semmsl=3D120
kern.ipc.semopm=3D200
kern.ipc.semume=3D80
kern.ipc.semusz=3D184
kern.ipc.semvmx=3D65534
kern.maxusers=3D1024
mlx4en_load=3D"YES"
net.fibs=3D2
net.inet.tcp.hostcache.cachelimit=3D"0"
net.inet.tcp.tcbhashsize=3D65536
net.inet.tcp.tso=3D0
net.isr.bindthreads=3D0
nmdm_load=3D"YES"
vfs.zfs.arc_max=3D"36G"
vfs.zfs.txg.timeout=3D"5"
vfs.zfs.write_limit_override=3D"536870912"
vfs.zfs.write_limit_override=3D"536870912"
vmm_load=3D"YES"
zfs_load=3D"YES"


One possible culprit is vfs.zfs.arc_max is set to size of phys memory. I am
adjusting that to half memory and rebooting.

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