Questions re swap-on-zfs

[Beeblebrox]

I have 2 swap devices on my system. #1-tank0/swap on ZFS, #2-/dev/ada0p1 on
SSD 1GB. I have some questions for swap-on-zfs:

1. I had read in the past that swap-on-zfs can cause instability if memory
gets used to full capacity. Is this still the case, or has that issue been
corrected? The reason I created swap-#2 is precisely for this purpose; a
small backup resource.

2. If the problem still persists, I would like to tweak the setup so that
swap-#2 is only used as last resort. I tried setting the priority (pri) in
fstab, but it does not seem to work - how can this be done?
/dev/ada0p1   none   swap   sw,pri=0   0  0
tank0/swap    none   zfs    sw,pri=9   0  0

3. Is it necessary for the data on swap to go through the Intent Log? I have
a separate ZIL device for tank0 pool. What risk is there if I disable the
log for the swap dataset? Is this done by modifying the "primarycache"
parameter for dataset?

4. Any other ideas to speed-up swap performance on tank0/swap?

Regards.



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