From owner-freebsd-current@FreeBSD.ORG Wed Sep 2 14:11:42 2009 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 89EA61065693 for ; Wed, 2 Sep 2009 14:11:42 +0000 (UTC) (envelope-from emikulic@gmail.com) Received: from ipmail03.adl6.internode.on.net (ipmail03.adl6.internode.on.net [203.16.214.141]) by mx1.freebsd.org (Postfix) with ESMTP id 1C2038FC29 for ; Wed, 2 Sep 2009 14:11:41 +0000 (UTC) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApsEAGsYnkqWZZrw/2dsb2JhbACRf7cjkhGEGwWBVw X-IronPort-AV: E=Sophos;i="4.44,318,1249223400"; d="scan'208";a="29019909" Received: from ppp154-240.static.internode.on.net ([150.101.154.240]) by ipmail03.adl6.internode.on.net with ESMTP; 02 Sep 2009 23:41:39 +0930 Received: by ppp154-240.static.internode.on.net (Poo-fix, from userid 1001) id 0360F5C80; Thu, 3 Sep 2009 00:11:39 +1000 (EST) Date: Thu, 3 Sep 2009 00:11:38 +1000 From: Emil Mikulic To: "Derek (freebsd lists)" <482254ac@razorfever.net> Message-ID: <20090902141138.GA15045@dmr.ath.cx> References: <4A9E5F34.2090700@razorfever.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4A9E5F34.2090700@razorfever.net> User-Agent: Mutt/1.5.20 (2009-06-14) Cc: freebsd-current@freebsd.org Subject: Re: siis/atacam/ata/gmirror 8.0-BETA3 disk performance X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 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: Wed, 02 Sep 2009 14:11:42 -0000 On Wed, Sep 02, 2009 at 08:04:04AM -0400, Derek (freebsd lists) wrote: > Hi, > > I've been testing the new siis driver, and I have found no > appreciable performance change, using dd as a measure of "raw" > performance. > > I get about 40MB/s read, and 30MB/s write. See attached > bench-*.txt files. [...] > ada0: ATA/ATAPI-8 SATA 2.x device > ada0: 1430799MB (2930277168 512 byte sectors: 16H 63S/T 16383C) Huh, I have the same disk: # dmesg | grep ad4 ad4: 1430799MB at ata2-master SATA300 Sequential read on a disk this size should be around 120MB/sec at the outer tracks: # dd if=/dev/ad4 of=/dev/null bs=128k count=5000 655360000 bytes transferred in 5.171389 secs (126728039 bytes/sec) > Also I find it surprising that my gmirror read is only 40MB/s, > and not 60-80MB/s, any thoughts on this? Stripe will give you higher throughput. Mirror will give you more random seeks per second. --Emil