From owner-freebsd-current@FreeBSD.ORG Fri May 21 16:10:27 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8B98716A4D6 for ; Fri, 21 May 2004 16:10:27 -0700 (PDT) Received: from hanoi.cronyx.ru (hanoi.cronyx.ru [144.206.181.53]) by mx1.FreeBSD.org (Postfix) with ESMTP id 8236743D41 for ; Fri, 21 May 2004 16:10:25 -0700 (PDT) (envelope-from rik@cronyx.ru) Received: (from root@localhost) by hanoi.cronyx.ru id i4LN8Btc001100 for freebsd-current@freebsd.org.checked; (8.12.8/vak/2.1) Sat, 22 May 2004 03:08:11 +0400 (MSD) (envelope-from rik@cronyx.ru) Received: from cronyx.ru (riklin.cronyx.ru [172.22.4.101]) by hanoi.cronyx.ru with ESMTP id i4LN7p1V001077; (8.12.8/vak/2.1) Sat, 22 May 2004 03:07:51 +0400 (MSD) (envelope-from rik@cronyx.ru) Message-ID: <40AE8A48.6090802@cronyx.ru> Date: Sat, 22 May 2004 03:01:28 +0400 From: Roman Kurakin User-Agent: Mozilla/5.0 (X11; U; Linux i686; ru-RU; rv:1.2.1) Gecko/20030426 X-Accept-Language: ru-ru, en MIME-Version: 1.0 To: Kevin Oberman References: <20040521224729.680285D0A@ptavv.es.net> In-Reply-To: <20040521224729.680285D0A@ptavv.es.net> Content-Type: text/plain; charset=KOI8-R; format=flowed Content-Transfer-Encoding: 8bit cc: freebsd-current@freebsd.org Subject: Re: Disk performance under CURRENT X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 May 2004 23:10:27 -0000 Did you turn off things such as WITNESS and other debug? rik Kevin Oberman пишет: >I just ran test of disk writing performance under V4 (STABLE) and V5 >(CURRENT) and was surprised at the difference. > >The test was simple and not at all rigorous. Just a dd bs=256k >if=/dev/zero of=/dev/ad2. This is about the simplest way of dealing with >a disk. No file system or anything else. Just raw data to the device. > >Under STABLE, I get an average of 25 MB/sec to the disk. Under CURRENT, >it drops to 15 MB/sec. I did this because I had noted that it was now >taking over an hour to backup my system disk (40 GB) when it was only >taking 40 minutes when I was running V4.6. The STABLE system was built >yesterday. The CURRENT system last Sunday. > >Any idea why this is so much slower? It looks to me like it must be in >either geom or the disk driver. > >