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Date: Thu, 21 Jan 2016 23:17:05 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Mason Loring Bliss <mason@blisses.org>
cc: dweimer <dweimer@dweimer.net>, freebsd-questions@freebsd.org
Subject: Re: ZFS performance help sought
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On Thu, 21 Jan 2016, Mason Loring Bliss wrote:
>
> Again, FreeBSD 10.2, ZFS tuned at noted above, and with prefetch disabled.

I know there was some sort of ZFS resource exhaustion issue worked on 
recently, but I don't recally exactly when or what the symptoms were. 
It might only be in 10-stable so far.  Best to ask on the freebsd-fs 
mailing list.