From owner-freebsd-fs@FreeBSD.ORG  Wed Jan 16 09:39:42 2013
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Date: Wed, 16 Jan 2013 11:39:29 +0200
From: Andriy Gapon <avg@FreeBSD.org>
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To: Nicolas Rachinsky <fbsd-mas-0@ml.turing-complete.org>
Subject: Re: slowdown of zfs (tx->tx)
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on 16/01/2013 02:16 Artem Belevich said the following:
> It appears that lots of threads are stuck in
> metaslab_activate->space_map_load_wait path.

Nicolas,

another thing to check - is your pool nearly full.

-- 
Andriy Gapon