From owner-freebsd-fs@FreeBSD.ORG  Tue Jun 26 16:29:51 2012
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 8314B1065670;
	Tue, 26 Jun 2012 16:29:51 +0000 (UTC) (envelope-from avg@FreeBSD.org)
Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140])
	by mx1.freebsd.org (Postfix) with ESMTP id A04EE8FC19;
	Tue, 26 Jun 2012 16:29:50 +0000 (UTC)
Received: from odyssey.starpoint.kiev.ua (alpha-e.starpoint.kiev.ua
	[212.40.38.101])
	by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id TAA04537;
	Tue, 26 Jun 2012 19:29:43 +0300 (EEST)
	(envelope-from avg@FreeBSD.org)
Message-ID: <4FE9E376.8030209@FreeBSD.org>
Date: Tue, 26 Jun 2012 19:29:42 +0300
From: Andriy Gapon <avg@FreeBSD.org>
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64;
	rv:13.0) Gecko/20120610 Thunderbird/13.0
MIME-Version: 1.0
To: Mark Felder <feld@feld.me>
References: <201206251443.41768.jhb@freebsd.org> <op.wgik62ia34t2sn@tech304>
	<4FE9CC00.9090501@FreeBSD.org> <op.wgins2ez34t2sn@tech304>
	<4FE9DB60.1030905@FreeBSD.org> <op.wgio9gg934t2sn@tech304>
	<4FE9DE92.3040700@FreeBSD.org>
In-Reply-To: <4FE9DE92.3040700@FreeBSD.org>
X-Enigmail-Version: 1.4.2
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: freebsd-fs@FreeBSD.org
Subject: Re: [PATCH] Simple ARC stats in top
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/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: Tue, 26 Jun 2012 16:29:51 -0000

on 26/06/2012 19:08 Andriy Gapon said the following:
> So the correct ARC size breakdown is: hdr_size + data_size + other_size +
> l2_hdr_size, where data_size can further be broken down to mfu_size + mru_size +
> anon_size.
> 
> I think that users of zfs-stats / arc_summary.pl could benefit from this knowledge
> too.
> (I will repeat just in case that zfs-stats mistreats kstat.zfs.misc.arcstats.p as
> current MRU size whereas it is actually target MRU size)

Here's a quick attempt at reflecting my understanding of the stats in zfs-stats
code: http://people.freebsd.org/~avg/zfs-stats
I think that this variant of the script should produce results more aligned with
what top shows with John's patch.


-- 
Andriy Gapon