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Date: Thu, 30 Jul 2015 15:48:29 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Lev Serebryakov <lev@FreeBSD.org>
Cc: freebsd-fs@freebsd.org
Subject: Re: ZFS on 10-STABLE r281159: programs, accessing ZFS pauses for
 minutes in state [*kmem arena]
Message-ID: <20150730124829.GV2072@kib.kiev.ua>
References: <164833736.20150730143008@serebryakov.spb.ru>
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 <34202837.20150730153905@serebryakov.spb.ru>
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On Thu, Jul 30, 2015 at 03:39:05PM +0300, Lev Serebryakov wrote:
> Hello Konstantin,
> 
> Thursday, July 30, 2015, 3:18:40 PM, you wrote:
> 
> >>  rsync pauses for tens of minutes (!) after several hundreds of files. ^T
> >> and top shows state "[*kmem arena]". When I stop rsync with ^C and try to do
> >> "zfs list" it waits forever, in state "[*kmem arena]" again.
> > Show the output of sysctl debug.vmem_check.
>  It is 1.

So set it to zero.