Just a note to hopefully help someone else out.

I have been running VirtualBox on my sager laptop inside zfs partition with 
2Gbytes of ram build 82. Even though I had the Guest OS set to 600Meg. 
(WindowsXP) MY memory would keep dropping until I started seeing performance 
problems. I added another 2Gbyte of ram to the system but this only delayed the 
performance problem. I thought that it might have been a memory leak with 
VirtualBox but the process memory usage never grew.

I found the problem to be zfs cache. I believe this was caused by the large 
file size of VirtualBox and that ZFS cache keeps trying to bring it into 
memory. I have limited zfs cache down to 1Gbyte using the following line in 
/etc/system
set zfs:zfs_arc_max = 0x3E800000

The performance problems went away and VirtualBox is still happy.

Hope this is help to someone.
 
 
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