From owner-freebsd-fs@FreeBSD.ORG  Sun Dec 16 12:28:54 2012
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
 by hub.freebsd.org (Postfix) with ESMTP id 386E9BC
 for <freebsd-fs@FreeBSD.org>; Sun, 16 Dec 2012 12:28:54 +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 7F8B78FC16
 for <freebsd-fs@FreeBSD.org>; Sun, 16 Dec 2012 12:28:52 +0000 (UTC)
Received: from porto.starpoint.kiev.ua (porto-e.starpoint.kiev.ua
 [212.40.38.100])
 by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id OAA14025;
 Sun, 16 Dec 2012 14:28:50 +0200 (EET) (envelope-from avg@FreeBSD.org)
Received: from localhost ([127.0.0.1])
 by porto.starpoint.kiev.ua with esmtp (Exim 4.34 (FreeBSD))
 id 1TkDKr-00030i-L5; Sun, 16 Dec 2012 14:28:49 +0200
Message-ID: <50CDBE80.7080308@FreeBSD.org>
Date: Sun, 16 Dec 2012 14:28:48 +0200
From: Andriy Gapon <avg@FreeBSD.org>
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64;
 rv:17.0) Gecko/17.0 Thunderbird/17.0
MIME-Version: 1.0
To: Tom <freebsdlists@bsdunix.ch>
Subject: Re: zfs: is it possible to set metaslab_debug to 1?
References: <50CCA8B8.7010808@bsdunix.ch>
In-Reply-To: <50CCA8B8.7010808@bsdunix.ch>
X-Enigmail-Version: 1.4.6
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Cc: 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: Sun, 16 Dec 2012 12:28:54 -0000

on 15/12/2012 18:43 Tom said the following:
> Hi,
> 
> Is it possible to set metaslab_debug to 1 on freebsd without recompiling:
> usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/metaslab.c
> 
> /*
>  * Metaslab debugging: when set, keeps all space maps in core to verify
> frees.
>  */
> static int metaslab_debug = 0;
> 
> Is this even possible on FreeBSD? It often helps with ZFS perfomance
> issues on Solaris with lots of ram.

kgdb -w
set metaslab_debug=1

Were you looking for something like this?


-- 
Andriy Gapon