From owner-freebsd-fs@freebsd.org  Tue Aug 18 22:07:45 2015
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Date: Tue, 18 Aug 2015 18:07:44 -0400
Message-ID: <CAFMmRNzh9Yh9OBo9PVJ0MDKnD5gmzmDc3_dVGqNVJB8-0YUe-w@mail.gmail.com>
Subject: Re: dtrace script for io latency/throughput
From: Ryan Stone <rysto32@gmail.com>
To: "Michael W. Lucas" <mwlucas@michaelwlucas.com>
Cc: "freebsd-fs@freebsd.org" <fs@freebsd.org>
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Try this:

https://people.freebsd.org/~rstone/rw.d

I've run it on a recent-ish head and it appears to give reasonable data.