illumos gate

Hello guys i just create a ramdisk with the ramdiskadm command,

i create a zpool on it and i setup my zfs properties to:
recordsize 4k
checksum off
atime off
compression off
deduplication on
sync disabled

I put some vdi desktop on it (the dedup ratio is just awesome) but the performance are quite bad (only 1000 Iops by Desktop with 10 Desktop and a latency of 10 ms, it's just not good for a ramdisk).

Did someone play with ramdisk? Did i need special parameter to have good performance in that case?

Thanks