From owner-freebsd-fs@FreeBSD.ORG  Thu Mar 14 18:44:56 2013
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by hub.freebsd.org (Postfix) with ESMTP id C33DB47E
 for <freebsd-fs@freebsd.org>; Thu, 14 Mar 2013 18:44:56 +0000 (UTC)
 (envelope-from daniel@digsys.bg)
Received: from smtp-sofia.digsys.bg (smtp-sofia.digsys.bg [193.68.21.123])
 by mx1.freebsd.org (Postfix) with ESMTP id 183002B3
 for <freebsd-fs@freebsd.org>; Thu, 14 Mar 2013 18:44:55 +0000 (UTC)
Received: from [192.168.178.221] ([62.28.165.86]) (authenticated bits=0)
 by smtp-sofia.digsys.bg (8.14.6/8.14.6) with ESMTP id r2EIfxsq091921
 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NO);
 Thu, 14 Mar 2013 20:42:02 +0200 (EET)
 (envelope-from daniel@digsys.bg)
References: <CAOjFWZ6Q=Vs3P-kfGysLzSbw4CnfrJkMEka4AqfSrQJFZDP_qw@mail.gmail.com>
Mime-Version: 1.0 (1.0)
In-Reply-To: <CAOjFWZ6Q=Vs3P-kfGysLzSbw4CnfrJkMEka4AqfSrQJFZDP_qw@mail.gmail.com>
Content-Type: text/plain;
	charset=us-ascii
Content-Transfer-Encoding: quoted-printable
Message-Id: <26456299-66A3-4CCF-9B9A-906D47EFFC93@digsys.bg>
X-Mailer: iPad Mail (10B146)
From: Daniel Kalchev <daniel@digsys.bg>
Subject: Re: Strange slowdown when cache devices enabled in ZFS
Date: Thu, 14 Mar 2013 18:41:58 +0000
To: Freddie Cash <fjwcash@gmail.com>
Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org>
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
 <mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 14 Mar 2013 18:44:56 -0000

Just an idea - have you tried to increase the L2ARC fill rate? That might mo=
ve data faster from RAM to L2ARC.. Don't remember the says to offhand.

Might be dedup kicking in and not able to get "swapped out" fast enough.

Daniel=