On Sun, 23 Feb 2020 09:08:46 +1100 MJ <mafsys1...@gmail.com> wrote: > > On 23/02/2020 1:12 am, Sad Clouds wrote: > > I'm trying out NetBSD-9 with ZFS on raspberry pi 3. I have 128GB > > USB SD card which has ZFS setup. Noticed that sometimes when under > > heavy use something goes wrong and pgdaemon spins on CPU 100% all > > the time. > > > > Not sure if this is something to do with small amount of RAM on this > > machine. Are there any tunables like in FreeBSD > > > > vm.kmem_size="330M" > > vm.kmem_size_max="330M" > > vfs.zfs.arc_max="40M" > > vfs.zfs.vdev.cache.size="5M" > > > > that make ZFS play nice when low on RAM? Looked at "sysctl -a" but > > there are only kstat parameters, I assume they are only for > > statistics and don't affect run-time? > > > ZFS on Raspberry Pi? Nope. Not enough memory. Stick to FFS. > > Even a Pi 4 still doesn't have enough, unless all you want to use it > for is run ZFS and NOTHING else. > >
Yeah, I noticed at lot of system issues/crashes with ZFS on rpi3, so far FFS has been pretty stable. Although I do have 4GiB rpi4, not tried it with ZFS yet, but I would have thought that this amount of RAM would have been sufficient. I've seen some references on the net that state 8GiB is the minimum, however I have 2GiB NetBSD VM in a VirtualBox with ZFS configured and not seen any issues over the last few days of random testing.
