From owner-freebsd-fs@FreeBSD.ORG  Thu Sep 16 17:00:53 2010
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Date: Thu, 16 Sep 2010 19:32:35 +0300
From: Daniel Kalchev <daniel@digsys.bg>
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Subject: Swap on ZFS Volume still panics?
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  Have been using swap on ZFS for a while. 8 GB RAM, in=20
/boot/loader.conf only:

vm.kmem_size=3D"12G"

KDE workstation with two 500GB drives in ZFS mirror. Swap volume is

NAME          PROPERTY              VALUE                  SOURCE
storage/swap  type                  volume                 -
storage/swap  creation              =D1=F0  =DE=ED=E8 16 14:17 2010  -
storage/swap  used                  16G                    -
storage/swap  available             58,6G                  -
storage/swap  referenced            3,99G                  -
storage/swap  compressratio         1.00x                  -
storage/swap  reservation           none                   default
storage/swap  volsize               16G                    -
storage/swap  volblocksize          8K                     -
storage/swap  checksum              off                    local
storage/swap  compression           on                     local
storage/swap  readonly              off                    default
storage/swap  shareiscsi            off                    default
storage/swap  copies                1                      default
storage/swap  refreservation        16G                    local
storage/swap  primarycache          all                    default
storage/swap  secondarycache        all                    default
storage/swap  usedbysnapshots       0                      -
storage/swap  usedbydataset         3,99G                  -
storage/swap  usedbychildren        0                      -
storage/swap  usedbyrefreservation  12,0G                  -
storage/swap  org.freebsd:swap      on                     local


Just added compression by the way, haven't yet seen it in action.=20
Sometimes, it swaps up to 2-4 GB. Swapping is noticeably slow.

Never had hangs or kernel panics.

Daniel