From owner-freebsd-hackers@FreeBSD.ORG  Tue May 22 17:15:26 2012
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id B3F341065670
	for <freebsd-hackers@freebsd.org>; Tue, 22 May 2012 17:15:26 +0000 (UTC)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from wojtek.tensor.gdynia.pl (wojtek.tensor.gdynia.pl [89.206.35.99])
	by mx1.freebsd.org (Postfix) with ESMTP id 19E0C8FC16
	for <freebsd-hackers@freebsd.org>; Tue, 22 May 2012 17:15:25 +0000 (UTC)
Received: from wojtek.tensor.gdynia.pl (localhost [127.0.0.1])
	by wojtek.tensor.gdynia.pl (8.14.5/8.14.5) with ESMTP id q4MHFI7O061186;
	Tue, 22 May 2012 19:15:18 +0200 (CEST)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Received: from localhost (wojtek@localhost)
	by wojtek.tensor.gdynia.pl (8.14.5/8.14.5/Submit) with ESMTP id
	q4MHFIqi061183; Tue, 22 May 2012 19:15:18 +0200 (CEST)
	(envelope-from wojtek@wojtek.tensor.gdynia.pl)
Date: Tue, 22 May 2012 19:15:17 +0200 (CEST)
From: User Wojtek <wojtek@wojtek.tensor.gdynia.pl>
To: Warren Block <wblock@wonkity.com>
In-Reply-To: <alpine.BSF.2.00.1205220731070.51493@wonkity.com>
Message-ID: <alpine.BSF.2.00.1205221914450.61179@wojtek.tensor.gdynia.pl>
References: <alpine.BSF.2.00.1205182209010.9350@wojtek.tensor.gdynia.pl>
	<4fb7dfd6.736a980a.186d.ffff902f@mx.google.com>
	<20120519180901.GA1264@tiny>
	<4fb7e819.6968700a.7a7f.ffff9153@mx.google.com>
	<20120522061734.GA1210@tiny>
	<alpine.BSF.2.00.1205220731070.51493@wonkity.com>
User-Agent: Alpine 2.00 (BSF 1167 2008-08-23)
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.2.7
	(wojtek.tensor.gdynia.pl [127.0.0.1]);
	Tue, 22 May 2012 19:15:18 +0200 (CEST)
Cc: freebsd-hackers@freebsd.org, Matthias Apitz <guru@unixarea.de>,
	rozhuk.im@gmail.com
Subject: Re: proper newfs options for SSD disk
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, 22 May 2012 17:15:26 -0000

>> What is wrong with this procedure?
>
> The filesystem partitions end up at locations that aren't even multiples of 
> 4K.  This can reduce performance.  How much probably depends on the SSD.
well in my case it is a multiply of any number you like

[root@wojtek ~]# bsdlabel ada0
# /dev/ada0:
8 partitions:
#          size     offset    fstype   [fsize bsize bps/cpg]
   a:  117231408          0    4.2BSD        0     0     0
   c:  117231408          0    unused        0     0     # "raw" part, don't edit