From owner-freebsd-hackers@FreeBSD.ORG  Fri Mar 25 23:44:49 2011
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 1BA08106564A;
	Fri, 25 Mar 2011 23:44:49 +0000 (UTC) (envelope-from imp@bsdimp.com)
Received: from harmony.bsdimp.com (bsdimp.com [199.45.160.85])
	by mx1.freebsd.org (Postfix) with ESMTP id BE7758FC12;
	Fri, 25 Mar 2011 23:44:48 +0000 (UTC)
Received: from [10.0.0.63] (63.imp.bsdimp.com [10.0.0.63] (may be forged))
	by harmony.bsdimp.com (8.14.3/8.14.1) with ESMTP id p2PNc6ql054135;
	Fri, 25 Mar 2011 17:38:08 -0600 (MDT) (envelope-from imp@bsdimp.com)
Mime-Version: 1.0 (Apple Message framework v1082)
Content-Type: text/plain; charset=us-ascii
From: Warner Losh <imp@bsdimp.com>
In-Reply-To: <BANLkTinQAwLCwZi7VXJKB90wn0kw0FvfHQ@mail.gmail.com>
Date: Fri, 25 Mar 2011 17:38:06 -0600
Content-Transfer-Encoding: quoted-printable
Message-Id: <89A0FF76-7907-4815-85D2-F87968939B66@bsdimp.com>
References: <20110325002115.GA323@freebsd.org>
	<20110325015508.GA14565@freebsd.org>
	<20110325024658.GA19544@freebsd.org>
	<336A9ACD-29BF-41C9-BC25-917CC1E4587D@bsdimp.com>
	<20110325195325.GA69264@freebsd.org>
	<AANLkTinEcT__Wtc6LkSyqqMnQwuKVUbZC4dPZvZH_dSX@mail.gmail.com>
	<D29C3B5E-5BB1-40B5-ACE3-7F560DCAE86D@bsdimp.com>
	<BANLkTinQAwLCwZi7VXJKB90wn0kw0FvfHQ@mail.gmail.com>
To: Xin LI <delphij@gmail.com>
X-Mailer: Apple Mail (2.1082)
Cc: Alexander Best <arundel@freebsd.org>, freebsd-hackers@freebsd.org
Subject: Re: Switching to [KMGTPE]i prefixes?
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: Fri, 25 Mar 2011 23:44:49 -0000


On Mar 25, 2011, at 5:28 PM, Xin LI wrote:

> On Fri, Mar 25, 2011 at 2:50 PM, Warner Losh <imp@bsdimp.com> wrote:
>> How did you guys deal with programs like df that now need to do =
special buffer size hacks to get consistent results?
>=20
> I think it doesn't really matter - caller have to specify using IEC
> prefixes explicitly, so old binaries won't be broken.  They must be
> updated to use the IEC prefixes.

My patch had a 'force IEC prefixes' compile time option which did.

However, you'll have to monkey around with df to get it to do the right =
thing since the buffer sizes and such will need to be 1 longer for the =
extra 'i' in the mix now...  And it can' t be unconditional, since then =
you'd get different results with the non IEC case.

That's a short way of saying that this patch is necessary, but not =
sufficient for the current system.  We'll need a lot of tweaks to the =
rest of the system for it to behave correctly.

Warner