From owner-svn-src-head@FreeBSD.ORG  Sat Dec 15 21:35:12 2012
Return-Path: <owner-svn-src-head@FreeBSD.ORG>
Delivered-To: svn-src-head@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
 by hub.freebsd.org (Postfix) with ESMTP id 7E06CE7B;
 Sat, 15 Dec 2012 21:35:12 +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 6C6CC8FC0A;
 Sat, 15 Dec 2012 21:35:10 +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 XAA10491;
 Sat, 15 Dec 2012 23:35:02 +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 1TjzNu-00024L-Cs; Sat, 15 Dec 2012 23:35:02 +0200
Message-ID: <50CCED04.1000101@FreeBSD.org>
Date: Sat, 15 Dec 2012 23:35:00 +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: Pawel Jakub Dawidek <pjd@FreeBSD.org>
Subject: Re: svn commit: r244112 - head/sys/kern
References: <201212110708.qBB78EWx025288@svn.freebsd.org>
 <201212121046.43706.jhb@freebsd.org>
 <CAJ-Vmo=U04GX+ZyKuzXLwV+PpzU6_dm5BCmL=DWfsmhTVAR+sA@mail.gmail.com>
 <201212121658.49048.jhb@freebsd.org> <50C90567.8080406@FreeBSD.org>
 <50C909BD.9090709@mu.org> <50C91B32.4080904@FreeBSD.org>
 <50C91CD3.7030900@mu.org> <50C9206D.6080502@FreeBSD.org>
 <50C9271C.70803@mu.org> <20121215210333.GH1411@garage.freebsd.pl>
In-Reply-To: <20121215210333.GH1411@garage.freebsd.pl>
X-Enigmail-Version: 1.4.6
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Cc: Adrian Chadd <adrian@FreeBSD.org>, Alfred Perlstein <alfred@FreeBSD.org>,
 John Baldwin <jhb@FreeBSD.org>, svn-src-all@FreeBSD.org,
 Alfred Perlstein <bright@mu.org>, src-committers@FreeBSD.org,
 Navdeep Parhar <np@FreeBSD.org>, svn-src-head@FreeBSD.org
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.14
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 15 Dec 2012 21:35:12 -0000

on 15/12/2012 23:03 Pawel Jakub Dawidek said the following:
> On Wed, Dec 12, 2012 at 04:53:48PM -0800, Alfred Perlstein wrote:
>> Like what if I do gzipp'd kernel dumps next? (on my todo list)  How many
>>  people will complain that "gzip is too dangerous in kernel context foo 
>> foo!!!!"
>> 
>> Not sure, I guess I'll find out?
> 
> Well... :) savecore(8) has an option to compress the dumps. The only use 
> case for compressing-while-dumping I see is small swap/dump partition. I'm
> not against this change, but I would not use it myself. When you are 
> dumping your kernel is in undefined state, so the less code you execute in
> that state the higher chances your dump will succeed. I much prefer to
> either compress the dumps with savecore(8) or use ZFS dataset with 
> compression enabled for /var/crash/.

Actually compressing core is a good thing when done right.  It can speed up
the core dumping process in addition to requiring less space.

-- 
Andriy Gapon