ZFS performance

[Ståle Kristoffersen]

I'm having trouble with performance using ZFS as the filesystem.
I earlier ran UFS and had no problems pushing 50MB/s trough the network.
Now with ZFS i even have problems reading 15MB/s locally. From the output
of iostat and zpool iostat it looks like it reads about 2 times as much
data from the disc compared to how much the program receive. (using dd, ftp
or samba)

Is there anything I could check? I've tried some sysctl settings:
kern.ipc.shm_use_phys=1
vfs.vmiodirenable=1
vfs.hirunningspace=10485760
vfs.lorunningspace=10485760
net.inet.tcp.sendspace=65536
net.inet.tcp.recvspace=65536
net.inet.tcp.delayed_ack=0

but that did not do much difference.
-- 
Ståle Kristoffersen
staalebk at ifi.uio.no