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Date: Thu, 30 Jul 2015 15:55:01 +0300
From: Lev Serebryakov <lev@FreeBSD.org>
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Message-ID: <1617907428.20150730155501@serebryakov.spb.ru>
To: Konstantin Belousov <kostikbel@gmail.com>
CC: freebsd-fs@freebsd.org
Subject: Re: ZFS on 10-STABLE r281159: programs,
 accessing ZFS pauses for minutes in state [*kmem arena]
In-Reply-To: <20150730124829.GV2072@kib.kiev.ua>
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Hello Konstantin,

Thursday, July 30, 2015, 3:48:29 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.
 It improved situation by itself, but limiting ARC to 3GiB is helped much more.

  Looks like, ARC auto-sizing should be tuned anyway (PR187594? It is already
 more than year old!)

-- 
Best regards,
 Lev                            mailto:lev@FreeBSD.org