From owner-freebsd-hackers@FreeBSD.ORG  Tue Oct 10 19:59:59 2006
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
X-Original-To: freebsd-hackers@FreeBSD.ORG
Delivered-To: freebsd-hackers@FreeBSD.ORG
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 0CF6616A417
	for <freebsd-hackers@FreeBSD.ORG>; Tue, 10 Oct 2006 19:59:59 +0000 (UTC)
	(envelope-from mwm-keyword-freebsdhackers2.e313df@mired.org)
Received: from mired.org (vpn.mired.org [66.92.153.74])
	by mx1.FreeBSD.org (Postfix) with SMTP id 09DC043D5F
	for <freebsd-hackers@FreeBSD.ORG>; Tue, 10 Oct 2006 19:59:38 +0000 (GMT)
	(envelope-from mwm-keyword-freebsdhackers2.e313df@mired.org)
Received: (qmail 17941 invoked by uid 1001); 10 Oct 2006 19:59:47 -0000
Received: by bhuda.mired.org (tmda-sendmail, from uid 1001);
	Tue, 10 Oct 2006 15:59:47 -0400 (EDT)
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-ID: <17707.64434.913943.549852@bhuda.mired.org>
Date: Tue, 10 Oct 2006 15:59:46 -0400
To: freebsd-hackers@FreeBSD.ORG
In-Reply-To: <200610101727.k9AHRrYo039774@lurza.secnetix.de>
References: <200610101727.k9AHRrYo039774@lurza.secnetix.de>
X-Mailer: VM 7.17 under 21.4 (patch 19) "Constant Variable" XEmacs Lucid
X-Primary-Address: mwm@mired.org
X-face: "5Mnwy%?j>IIV\)A=):rjWL~NB2aH[}Yq8Z=u~vJ`"(,&SiLvbbz2W`;
	h9L,Yg`+vb1>RG% *h+%X^n0EZd>TM8_IB;a8F?(Fb"lw'IgCoyM.[Lg#r\
From: Mike Meyer <mwm-keyword-freebsdhackers2.e313df@mired.org>
X-Delivery-Agent: TMDA/1.0.3 (Seattle Slew)
Cc: 
Subject: Re: "tar -c|gzip" faster than "tar -cz"?!?
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 10 Oct 2006 19:59:59 -0000

In <200610101727.k9AHRrYo039774@lurza.secnetix.de>, Oliver Fromme <olli@lurza.secnetix.de> typed:
> Is that a known problem?  Is someone working on it?

Not necessarily a known problem, but not a surprise. I'm not sure
about the size issue - it's not clear what compression level it's
running at. The real time difference is expected. tar uses libarchive,
which does the compression in the process. So while piping tar's
output to gzip will let gzip compress data while tar is waiting on
disk I/O, having tar compress things for you means that doesn't
happen. Fixing that is a non-trivial task.

Since they use different code - with different licenses - some
difference is expected.

	<mike
-- 
Mike Meyer <mwm@mired.org>		http://www.mired.org/consulting.html
Independent Network/Unix/Perforce consultant, email for more information.