From owner-freebsd-performance@FreeBSD.ORG Fri Jun 10 15:09:16 2005 Return-Path: X-Original-To: freebsd-performance@freebsd.org 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 D16F416A41C for ; Fri, 10 Jun 2005 15:09:16 +0000 (GMT) (envelope-from scuba@centroin.com.br) Received: from gorgo.centroin.com.br (gorgo.centroin.com.br [200.225.63.128]) by mx1.FreeBSD.org (Postfix) with ESMTP id 421F243D1F for ; Fri, 10 Jun 2005 15:09:15 +0000 (GMT) (envelope-from scuba@centroin.com.br) Received: from hypselo.centroin.com.br (hypselo.centroin.com.br [200.225.63.1]) by gorgo.centroin.com.br (8.12.10/8.12.9) with ESMTP id j5AF9Awq010204; Fri, 10 Jun 2005 12:09:11 -0300 (EST) Date: Fri, 10 Jun 2005 12:09:10 -0300 (EST) From: Sender: To: Glenn Dawson In-Reply-To: <6.1.0.6.2.20050604230636.01bf68c0@cobalt.antimatter.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: freebsd-performance@freebsd.org Subject: Re: vn(4) performance on 4.11 versus md(4) on 5.4 X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 10 Jun 2005 15:09:16 -0000 Hi Glenn, =09Have already fixed that problem? =09Your tests were on the same hardware? =09I=B4ve tested two of my boxes one with, FBSD 4.9 and another with the latest cvs 5.4. =09They=B4re not the same hardware but the performance with md drive was MUCH faster with 5.4. =09TEsted with 'dd': =094.9: dd if=3D/dev/zero of=3DTESTE count=3D1000 bs=3D64k 1000+0 records in 1000+0 records out 65536000 bytes transferred in 1.005721 secs (65163195 bytes/sec) =095.4: dd if=3D/dev/zero of=3DTESTE count=3D1000 bs=3D64k 1000+0 records in 1000+0 records out 65536000 bytes transferred in 0.241217 secs (271688824 bytes/sec) - Marcelo Souza On Sat, 4 Jun 2005, Glenn Dawson wrote: | | | |I have a number of systems running 4.11 that have file backed virtual |disks, each of which contains a jail. I need to start using 5.4 for new |servers. The catch is, file backed virtual disks using md(4) seem to be |much slower than similar virtual disks on 4.11 using vn(4). vn(4) on 4.11 |is about 2.24 times faster than the equivalent setup using md(4) on 5.4. | |I've posted the results of some tests that I ran at |http://www.antimatter.net/md-versus-vn.txt | |Is this decrease in performance known? Is there something I can do in |order to come close to the performance that 4.11 has? I've tried changing |some of the parameters of the filesystem on the virtual disk, but the |performance didn't change. | |I can supply more info than what the link above has, if needed. |If I should post this to another list please let me know. (I started here |in order to avoid cross posting. | |-Glenn | |_______________________________________________ |freebsd-performance@freebsd.org mailing list |http://lists.freebsd.org/mailman/listinfo/freebsd-performance |To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.= org" | - Marcelo