From owner-freebsd-performance@FreeBSD.ORG Mon May 5 07:31:08 2003 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A1A0C37B401 for ; Mon, 5 May 2003 07:31:08 -0700 (PDT) Received: from heron.mail.pas.earthlink.net (heron.mail.pas.earthlink.net [207.217.120.189]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2A4FB43F3F for ; Mon, 5 May 2003 07:31:08 -0700 (PDT) (envelope-from tlambert2@mindspring.com) Received: from pool0250.cvx22-bradley.dialup.earthlink.net ([209.179.198.250] helo=mindspring.com) by heron.mail.pas.earthlink.net with asmtp (SSLv3:RC4-MD5:128) (Exim 3.33 #1) id 19Cgzg-00073i-00; Mon, 05 May 2003 07:31:05 -0700 Message-ID: <3EB6755A.BC035326@mindspring.com> Date: Mon, 05 May 2003 07:29:46 -0700 From: Terry Lambert X-Mailer: Mozilla 4.79 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Artem Tepponen References: <5235EF9BAE6B7F4CB3735789EEF73B29B06A68@turtle.egar.egartech.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-ELNK-Trace: b1a02af9316fbb217a47c185c03b154d40683398e744b8a4a7e498d60fb0a6ffb592ea16c4c3d887666fa475841a1c7a350badd9bab72f9c350badd9bab72f9c cc: freebsd-performance@freebsd.org Subject: Re: freebsd-performance Digest, Vol 3, Issue X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 May 2003 14:31:08 -0000 Artem Tepponen wrote: > > Old People. > > > > It's the same reason that people think 8% of a 120GB hard drive > > is "a lot of space" and refuse to set their free reserve on their > > FS's high enough to avoid fragmentation. > > Should they be asking 'Why FS design is so flawed > that it has this requirement' instead? Not really. They should be asking "Why do I think this is an abnormal amount of overhead compared to, say, the second of the two journal files NT maintains?". > Is there any working FS for FreeBSD that does not have this requirement? There are several, including a number of Linux-originated ones; however, lacking the requirement, they are all subject to internal fragmentation and needing a defragger or cleaner process in order to deal with the problem. UFS doesn't require this. I wish people would read and understand Donald Knuth's books on algorithms... -- Terry