From owner-freebsd-hardware@FreeBSD.ORG Fri Sep 19 15:31:07 2008 Return-Path: Delivered-To: freebsd-hardware@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 3866C1065674 for ; Fri, 19 Sep 2008 15:31:07 +0000 (UTC) (envelope-from bsd@fluffles.net) Received: from mail.fluffles.net (fluffles.net [80.69.95.190]) by mx1.freebsd.org (Postfix) with ESMTP id 0199C8FC1E for ; Fri, 19 Sep 2008 15:31:06 +0000 (UTC) (envelope-from bsd@fluffles.net) Received: from [10.10.0.2] (cust.95.160.adsl.cistron.nl [195.64.95.160]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: info@fluffles.net) by mail.fluffles.net (Postfix) with ESMTP id BBEEBB29D5D; Fri, 19 Sep 2008 17:32:11 +0200 (CEST) Message-ID: <48D3C64A.5010207@fluffles.net> Date: Fri, 19 Sep 2008 17:33:30 +0200 From: "fluffles.net" User-Agent: Thunderbird 2.0.0.16 (X11/20080724) MIME-Version: 1.0 To: Dieter References: <200809190548.FAA08998@sopwith.solgatos.com> In-Reply-To: <200809190548.FAA08998@sopwith.solgatos.com> Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Cc: freebsd-hardware@freebsd.org Subject: Re: Test: HighPoint RocketRaid 3120 PCIex1 2xSATA controller under FreeBSD 7.1-PRERELEASE X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Sep 2008 15:31:07 -0000 Dieter wrote: >> If you get about the same scores with dd, try using a higher read-ahead >> (vfs.read_max value, set it to 32 for example). Also sometimes it's >> required to use a higher blocksize to get full potential, try: >> >> newfs -U -b 32768 /dev/ >> >> Warning: using 64KiB blocksize you risk hanging the system under heavy >> load (like 2 bonnies running simultaniously). >> > > What's this about 64KiB blocksize hanging the system? > Hang awhile then recover, or hang forever need a reboot? > Is this a RAID thing or are normal disks at risk? > See this, posted 2 years ago to freebsd-fs: http://freebsd.monkey.org/freebsd-fs/200610/msg00024.html Scott Long says the bug in vfs_bio.c is known but difficult to fix. They also argued that using a 64KiB blocksize should not be necessary. I have been getting slightly higher scores with 64KiB blocksize though, also with perfect alignment. 32KiB should be safe to use, i have not managed to crash the system under heavy I/O load. I'm curious if my suggestions gave you any better results, though. Regards, Veronica