Regarding the bold statement 

        There is no NFS over ZFS issue


What   I  mean here  is that,    if  you  _do_  encounter  a
performance pathology not  linked to the NVRAM Storage/cache
flush issue then you _should_ complain or better get someone
to do an analysis of the situation.

One  should   not  assume that some    observed pathological
performance of  NFS/ZFS is widespread and due  to some known
ZFS issue about to be fixed.

To be sure, there are lots of performance opportunities that
will provide incremental  improvements the most  significant
of which "ZFS    Separate  Intent Log"  just  integrated  in
Nevada. This     opens  up the   field   for further NFS/ZFS
performance investigations.

But the data that got this thread  started seem to highlight
an NFS   vs Samba opportinity,   something  we need  to look
into. Otherwise I don't think that the  data produced so far
has hightlighted   any specific  NFS/ZFS issue.    There are
certainly   opportinities    for   incremental   performance
improvements but, to the best of my knowledge, outside the
NVRAM/Flush issue on certain storage :


        There are no known prevalent NFS over ZFS performance
        pathologies on record.


-r


Ref: 
http://mail.opensolaris.org/pipermail/zfs-discuss/2007-June/thread.html#29026


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