From owner-freebsd-questions@FreeBSD.ORG Mon Jun 4 22:30:22 2007 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id AB58416A421; Mon, 4 Jun 2007 22:30:22 +0000 (UTC) (envelope-from kris@obsecurity.org) Received: from elvis.mu.org (elvis.mu.org [192.203.228.196]) by mx1.freebsd.org (Postfix) with ESMTP id 97C2D13C458; Mon, 4 Jun 2007 22:30:22 +0000 (UTC) (envelope-from kris@obsecurity.org) Received: from obsecurity.dyndns.org (elvis.mu.org [192.203.228.196]) by elvis.mu.org (Postfix) with ESMTP id 2262E1A3C19; Mon, 4 Jun 2007 15:31:39 -0700 (PDT) Received: from rot13.obsecurity.org (rot13.obsecurity.org [192.168.1.5]) by obsecurity.dyndns.org (Postfix) with ESMTP id E873D5144F; Mon, 4 Jun 2007 18:30:21 -0400 (EDT) Received: by rot13.obsecurity.org (Postfix, from userid 1001) id D5EB4C204; Mon, 4 Jun 2007 18:30:21 -0400 (EDT) Date: Mon, 4 Jun 2007 18:30:21 -0400 From: Kris Kennaway To: Chris Message-ID: <20070604223021.GA31853@rot13.obsecurity.org> References: <466451CA.6020108@tundraware.com> <4664572A.4060003@freebsd.org> <3aaaa3a0706041254r257e1480g872faa6e504df6dc@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3aaaa3a0706041254r257e1480g872faa6e504df6dc@mail.gmail.com> User-Agent: Mutt/1.4.2.2i Cc: Tim Daneliuk , freebsd-questions@freebsd.org, Colin Percival Subject: Re: New != Faster X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Jun 2007 22:30:22 -0000 On Mon, Jun 04, 2007 at 08:54:50PM +0100, Chris wrote: > On 04/06/07, Colin Percival wrote: > >Tim Daneliuk wrote: > >> Old 2 PIII @600Mhz 768K 26M/sec 4.11-stable/SMP > >> 50-60 min > >> New Pent D (2 core)@3.2GHz 2G 50M/sec 6.2-stable/SMP > >> 40-50 min > >> Fast 2 Xeon @3GHz 3G 130M/sec 4.11-stable/SMP > >> 8 min > >> > >> Is the difference in speed > >> attributable to 4.11 being faster than 6.2? > > > >Close. The difference in speed is due to the compiler in 4.11 being > >faster than the compiler in 6.2. FreeBSD uses the gcc compiler, and > >between FreeBSD 4.11 and FreeBSD 6.2 that has been upgraded from 2.9 > >to 3.4. The general trend each time gcc is upgraded is that it takes > >2x longer to compile code, but produces code which is 5% faster (as a > >result of "working harder" to find optimizations). > > > >FreeBSD 6.2 is faster than FreeBSD 4.11 for almost everything except > >compiling itself. :-) > > > >Colin Percival > > > >_______________________________________________ > >freebsd-questions@freebsd.org mailing list > >http://lists.freebsd.org/mailman/listinfo/freebsd-questions > >To unsubscribe, send any mail to > >"freebsd-questions-unsubscribe@freebsd.org" > > > > What about all the following observations? > > slower disk performance especially under QUOTA. s/especially//, unless you have further evidence I don't know about. > both of these have been confirmed numerous times by different people > so sweeping them under the carpet and saying they simply not true > would be wrong. My detailed measurements of disk performance and those of others I am aware of contradicts your claim: 6.x equals or outperforms 4.x on disk I/O (depends on driver) and filesystem I/O. The only true part of it is the "under QUOTA" part, which as you know from past discussions, is still under Giant in 6.x. As you also know, there is a patch to address this which is awaiting user testing. Have you tested it yet? Kris