Another ZFS ARC memory question

[Slawa Olhovchenkov]

On Tue, Feb 28, 2012 at 05:14:37AM +1100, Peter Jeremy wrote:

> >      * what is the community's advice for production machines running
> >        ZFS on FreeBSD, is manually limiting the ARC cache (to ensure
> >        that there's enough actually free memory to handle a spike in
> >        application memory usage) the best solution to this
> >        spike-in-memory-means-crash problem?
> 
> Are you swapping onto a ZFS vdev?  If so, change back to a raw (or
> geom) device - swapping to ZFS is known to be problematic.  If you

I see kernel stuck when swapping to ZFS. This is only known problem?