From owner-freebsd-stable@FreeBSD.ORG Thu Jan 29 15:57:20 2009 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E6999106564A for ; Thu, 29 Jan 2009 15:57:20 +0000 (UTC) (envelope-from richardtector@thekeelecentre.com) Received: from mx0.thekeelecentre.com (mx0.thekeelecentre.com [IPv6:2001:470:1f09:16f:2::3]) by mx1.freebsd.org (Postfix) with ESMTP id 735C88FC0C for ; Thu, 29 Jan 2009 15:57:20 +0000 (UTC) (envelope-from richardtector@thekeelecentre.com) Received: from localhost (filter.mx0.thekeelecentre.com [217.206.238.165]) by mx0.thekeelecentre.com (Postfix) with ESMTP id 81C1C45020; Thu, 29 Jan 2009 15:57:19 +0000 (GMT) X-Virus-Scanned: amavisd-new at thekeelecentre.com Received: from mx0.thekeelecentre.com ([217.206.238.167]) by localhost (filter.mx0.thekeelecentre.com [217.206.238.165]) (amavisd-new, port 10024) with ESMTP id 0uv7Vn1LdYKu; Thu, 29 Jan 2009 15:57:13 +0000 (UTC) Received: from [10.0.2.11] (daffy.tector.org.uk [82.71.32.9]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx0.thekeelecentre.com (Postfix) with ESMTPSA id AFC234502B; Thu, 29 Jan 2009 15:57:12 +0000 (GMT) Message-ID: <4981D1C6.6070605@thekeelecentre.com> Date: Thu, 29 Jan 2009 15:56:54 +0000 From: Richard Tector User-Agent: Thunderbird 2.0.0.19 (Windows/20081209) MIME-Version: 1.0 To: "Peter C. Lai" References: <49819672.1090208@thekeelecentre.com> <20090129154828.GC63236@cesium.hyperfine.info> In-Reply-To: <20090129154828.GC63236@cesium.hyperfine.info> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms070108010008050208080406" Cc: Charles Sprickman , freebsd-stable@freebsd.org Subject: Re: 7.1, mpt and slow writes X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Jan 2009 15:57:21 -0000 This is a cryptographically signed message in MIME format. --------------ms070108010008050208080406 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Peter C. Lai wrote: > I am guessing this is only related to SATA drives on SAS controllers? > The only mpt hardware I have is LSILogic 1030 Ultra4 and it writes > sustained 40MB/s to my LTO-2 drives out of the box without any tweaking. Correct. When SATA drives are used instead of SAS drives on this controller it disables the write cache resulting in poor performance. The tunable was added by Scott Long to solve the problem (though at the cost of greater risk to data). 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