From owner-freebsd-performance@FreeBSD.ORG Thu Oct 23 18:16:07 2008 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 05D9F106566B for ; Thu, 23 Oct 2008 18:16:07 +0000 (UTC) (envelope-from jpaetzel@FreeBSD.org) Received: from mail.tcbug.org (mail.tcbug.org [216.243.150.78]) by mx1.freebsd.org (Postfix) with ESMTP id D9CAC8FC12 for ; Thu, 23 Oct 2008 18:16:06 +0000 (UTC) (envelope-from jpaetzel@FreeBSD.org) Received: from [192.168.1.127] (c-24-118-145-206.hsd1.mn.comcast.net [24.118.145.206]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.tcbug.org (Postfix) with ESMTPSA id 43431169E527; Thu, 23 Oct 2008 12:57:18 -0500 (CDT) Message-ID: <4900BAF7.8040101@FreeBSD.org> Date: Thu, 23 Oct 2008 12:57:11 -0500 From: Josh Paetzel User-Agent: Thunderbird 2.0.0.17 (Windows/20080914) MIME-Version: 1.0 To: Stephen Sanders References: <490097CC.9010802@opnet.com> In-Reply-To: <490097CC.9010802@opnet.com> X-Enigmail-Version: 0.95.7 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Thu, 23 Oct 2008 18:24:39 +0000 Cc: freebsd-performance@freebsd.org Subject: Re: Disk Throughput test 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: Thu, 23 Oct 2008 18:16:07 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Stephen Sanders wrote: > FreeBSD 6.3 > Dual Quad Core Xeon 5450@3Ghz > 16GB RAM > 3Ware 9650SE-ML / 256MB cache > 14 Seagate 750GB/7200RPM/ST375033ONS SATA drives > > We have an application that is streaming data to disk at the maximum > rate the controller can sustain. The controller should be able to > develop something on the order of 600MB/s but we're only getting 450MB/s. > > The application writes about 50GB into a file, closes the file, and then > starts another file. > > I've set all of the recommended settings from 3ware. I have tried > various settings for vfs.hirunningspace - various settings include > everything from 5MB to the cache size of the card (256MB). > > Does anyone know if there is some file system performance limit? > > Thanks > 3ware has recently released new firmware for the 9650 and 9690 cards that makes a huge difference in performance. I've noticed anywhere from 10-25% increases in real world disk I/O performance. There is no "file system performance limit" that magically caps sequential read/write speed to some arbitrary value. A lot of factors come together to give you a max speed. Obviously you are hitting a bottleneck somewhere that is lower than you think it should be. Does 3ware advertise the card is capable of 600 Megs/sec? It seems an 8x pci-e card would be capable of higher performance than that. - -- Thanks, Josh Paetzel PGP: 8A48 EF36 5E9F 4EDA 5ABC 11B4 26F9 01F1 27AF AECB -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (MingW32) iD8DBQFJALr3JvkB8SevrssRAqleAJ9oJCRkv9jOVwxCqYDlfaSj+blweACdFsBP TUEcv2yhQ3CBk/tLC5JmyJs= =h/mH -----END PGP SIGNATURE-----