ZFS Warning during boot, is there something to worry about?

[w0w]

Quote from system log:

May 9 19:28:31	kernel: ZFS storage pool version 28
May 9 19:28:31	kernel: ZFS filesystem version 5
May 9 19:28:31	kernel: in /boot/loader.conf.
May 9 19:28:31	kernel: Consider tuning vm.kmem_size and vm.kmem_size_max
May 9 19:28:31	kernel: ZFS WARNING: Recommended minimum kmem_size is 512MB; expect unstable behavior.
May 9 19:28:31	kernel: add "vfs.zfs.prefetch_disable=0" to /boot/loader.conf.
May 9 19:28:31	kernel: ZFS NOTICE: Prefetch is disabled by default on i386 -- to enable,
May 9 19:28:31	kernel: Trying to mount root from ufs:/dev/ad4s1a

[jasonlitka]

pfSense isn't using ZFS so I'm going to go with no.  Those are pretty standard messages though.  ZFS runs like crap on anything less than 4GB of RAM.

[jimp]

ZFS can be used if you monkey with the web-based installer (go to /installer/ when booted from the CD) but if you didn't manually go out of your way to set it up, it won't be used.

[dhatz]

I have also noticed the ZFS memory warnings and wanted to ask if the new 2.1-RC0 kernel has a larger memory footprint compared to a v2.1 kernel from a few months before.

I'm asking because a 256MB VM running the latest 2.1-i386 image with no packages installed, on a quiet network (only 17 states) consumes about 45% of memory, according to the Dashboard info …