> Just installed 2009.06 and encounter 100% kernel
> usage when I copy large files from the network to a
> zpool. I have tried to use both the smb client and
> rsync to do the transfer. 

Is the target zfs using compression (lzjb, or maybe gzip)?


> The transfer begins with no issues, however, after
> 20-30 seconds, kernel usage (as indicated by top)
> jumps to 99%-100% and stays there, even if I
> terminate the transfer. 

Try to profile the kernel to find out who's using the
kernel cpu time; as user root run:

   lockstat -kIW -D 20 sleep 20
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