From owner-freebsd-arch@FreeBSD.ORG  Fri Jan  1 11:25:34 2010
Return-Path: <owner-freebsd-arch@FreeBSD.ORG>
Delivered-To: freebsd-arch@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id AAA031065696;
	Fri,  1 Jan 2010 11:25:34 +0000 (UTC)
	(envelope-from phk@critter.freebsd.dk)
Received: from phk.freebsd.dk (phk.freebsd.dk [130.225.244.222])
	by mx1.freebsd.org (Postfix) with ESMTP id 6C2198FC17;
	Fri,  1 Jan 2010 11:25:34 +0000 (UTC)
Received: from critter.freebsd.dk (critter.freebsd.dk [192.168.61.3])
	by phk.freebsd.dk (Postfix) with ESMTP id B6A4F7E9E6;
	Fri,  1 Jan 2010 11:25:32 +0000 (UTC)
Received: from critter.freebsd.dk (localhost [127.0.0.1])
	by critter.freebsd.dk (8.14.3/8.14.3) with ESMTP id o01BQAkQ061365;
	Fri, 1 Jan 2010 11:26:10 GMT (envelope-from phk@critter.freebsd.dk)
To: Pieter de Goeje <pieter@degoeje.nl>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Thu, 31 Dec 2009 17:12:17 +0100."
	<200912311712.18347.pieter@degoeje.nl> 
Date: Fri, 01 Jan 2010 11:26:10 +0000
Message-ID: <61364.1262345170@critter.freebsd.dk>
Sender: phk@critter.freebsd.dk
Cc: Alexander Motin <mav@freebsd.org>, freebsd-current@freebsd.org,
	Miroslav Lachman <000.fbsd@quip.cz>,
	Thomas Backman <serenity@exscape.org>, freebsd-arch@freebsd.org
Subject: Re: File system blocks alignment 
X-BeenThere: freebsd-arch@freebsd.org
X-Mailman-Version: 2.1.5
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, 01 Jan 2010 11:25:34 -0000

In message <200912311712.18347.pieter@degoeje.nl>, Pieter de Goeje writes:

>Ok, as Miroslav wrote, it does not report 4k sectors:

If you care to, and have the time, try the following:


for N in (0...7)
	for M in (0..2)
		create partition starting at byte offset N*512
		newfs -f 4096 -b 32768 /dev/foo
		mount /dev/foo /mnt
		time restore(8) a filesystem into it.
		unmount /mnt
		time fsck_ffs /dev/foo
		mount /dev/foo /mnt
		time tar cf /dev/null  /mnt
		unmount /mnt

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.