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From: Ivan Voras <ivoras@freebsd.org>
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Subject: Re: Help ZFS FreeBSD 8.0 RC2 Write performance issue
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Sam Fourman Jr. wrote:
> Hello list,
> 
> I am running FreeBSD 8.0RC2 and I dont understand why my ZFS/NFS is
> acting weird on writes.
> I get ~150mbit writes idk if this is good or not? but it paused for a
> few seconds every once and awhile.

You didn't give any "iostat" statistics - I suspect that if you 
correlate ifstat and iostat output that you will see that network 
"pauses" happen during spikes in IO. You should check for this and post 
your results.