From owner-freebsd-arch@FreeBSD.ORG  Fri Apr  8 15:11:38 2005
Return-Path: <owner-freebsd-arch@FreeBSD.ORG>
Delivered-To: freebsd-arch@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id B111016A4CE
	for <freebsd-arch@freebsd.org>; Fri,  8 Apr 2005 15:11:38 +0000 (GMT)
Received: from blake.polstra.com (blake.polstra.com [64.81.189.66])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 1C17743D1D
	for <freebsd-arch@freebsd.org>; Fri,  8 Apr 2005 15:11:38 +0000 (GMT)
	(envelope-from jdp@polstra.com)
Received: from strings.polstra.com (dsl081-189-067.sea1.dsl.speakeasy.net
	[64.81.189.67])
	by blake.polstra.com (8.13.1/8.13.1) with ESMTP id j38FBbrt032904
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
	Fri, 8 Apr 2005 08:11:37 -0700 (PDT)
	(envelope-from jdp@strings.polstra.com)
Received: (from jdp@localhost)
	by strings.polstra.com (8.13.1/8.13.1/Submit) id j38FBa4B048590;
	Fri, 8 Apr 2005 08:11:36 -0700 (PDT)
	(envelope-from jdp)
Message-ID: <XFMail.20050408081136.jdp@polstra.com>
X-Mailer: XFMail 1.5.5 on FreeBSD
X-Priority: 3 (Normal)
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 8bit
MIME-Version: 1.0
In-Reply-To: <4254E2E9.2090504@wadham.ox.ac.uk>
Date: Fri, 08 Apr 2005 08:11:36 -0700 (PDT)
From: John Polstra <jdp@polstra.com>
To: Colin Percival <colin.percival@wadham.ox.ac.uk>
X-Bogosity: No, tests=bogofilter, spamicity=0.450984, version=0.14.5
cc: freebsd-arch@freebsd.org
Subject: Re: Adding bsdiff to the base system
X-BeenThere: freebsd-arch@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussion related to FreeBSD architecture
	<freebsd-arch.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arch>
List-Post: <mailto:freebsd-arch@freebsd.org>
List-Help: <mailto:freebsd-arch-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 08 Apr 2005 15:11:38 -0000

On 07-Apr-2005 Colin Percival wrote:
> The reason portsnap is more efficient lies in how portsnap and CVSup
> determine which files need to be updated.  The ports tree contains
> roughly 71000 files, and the first thing the CVSup client does is list
> all of these files and send that list to the server.
> 
> In contrast, portsnap has an index file -- containing, roughly speaking,
> that same list -- and the portsnap client merely sends the sha256 hash of
> this index file to the server, which responds with either "I recognize
> that index -- here's a patch which will turn it into the latest index"
> or "I don't recognize that -- here's the new index".

Nice!

John