While dd'ing to an nfs filesystem, half of the bandwidth is unaccounted
for.  What dd reports amounts to almost exactly half of what zpool iostat
or iostat show; even after accounting for the overhead of the two mirrored
vdevs.  Would anyone care to guess where it may be going?

(This is measured over 10 second intervals.  For 1 second intervals,
the bandwidth to the disks jumps around from <40MB/s to >240MB/s)

With a local dd, everything adds up.  This is with a b41 server, and a
MacOS 10.4 nfs client.  I have verified that the bandwidth at the network
interface is approximately that reported by dd, so the issue would appear
to be within the server.

Any suggestions would be welcome.

Chris
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