Hello, I tried enabling dedup on a filesystem, and moved files into it to take 
advantage of it. I had about 700GB of files and left it for some hours. When I 
returned, only 70GB were moved.

I checked zpool iostat, and it showed about 8MB/s R/W performance (the old and 
new zfs filesystems are in the same pool). So I disabled dedup for a few 
seconds and instantly the performance jumped to 80MB/s

It's Athlon64 x2 machine with 4GB RAM, it's only a fileserver (4x1TB SATA for 
ZFS). arcstat.pl shows 2G for arcsz, top shows 13% CPU during the 8MB/s 
transfers. 

Is this normal behavior? Should I always expect such low performance, or is 
there anything wrong with my setup? 

Thanks in advance,
Hernan
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