On Mon, 5 Dec 2011, Lachlan Mulcahy wrote:
genunix`list_next                                        5822   3.7%
unix`mach_cpu_idle                                     150261  96.1%


Rather idle.

Top shows:

   PID USERNAME NLWP PRI NICE  SIZE   RES STATE    TIME    CPU COMMAND
 22945 root        1  60    0   13M 3004K cpu/6  144:21  3.79% zfs
   550 root       28  59    0   39M   22M sleep   10:19  0.06% fmd

Having 'fmd' (fault monitor daemon) show up in top at all is rather ominous since it implies that faults are actively being reported. You might want to look into what is making it active.

So I'm lead to believe that zfs receive is spending almost 100% of a single 
CPUs time doing a lot of
genunix`list_next ...

Or maybe it is only doing 3.7% of this. There seems to be a whole lot of nothing going on.

Any ideas what is going on here?

Definitely check if low-level faults are being reported to fmd.

Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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