From owner-freebsd-questions@FreeBSD.ORG Mon Jul 25 21:39:59 2011 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 12A67106564A for ; Mon, 25 Jul 2011 21:39:59 +0000 (UTC) (envelope-from perryh@pluto.rain.com) Received: from agora.rdrop.com (agora.rdrop.com [IPv6:2607:f678:1010::34]) by mx1.freebsd.org (Postfix) with ESMTP id E62E28FC0C for ; Mon, 25 Jul 2011 21:39:58 +0000 (UTC) Received: from agora.rdrop.com (66@localhost [127.0.0.1]) by agora.rdrop.com (8.13.1/8.12.7) with ESMTP id p6PLdvUE003513 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Mon, 25 Jul 2011 14:39:58 -0700 (PDT) (envelope-from perryh@pluto.rain.com) Received: (from uucp@localhost) by agora.rdrop.com (8.13.1/8.12.9/Submit) with UUCP id p6PLdvOk003512; Mon, 25 Jul 2011 14:39:57 -0700 (PDT) Received: from fbsd81 ([192.168.200.81]) by pluto.rain.com (4.1/SMI-4.1-pluto-M2060407) id AA03370; Mon, 25 Jul 11 14:32:14 PDT Date: Mon, 25 Jul 2011 21:32:25 -0700 From: perryh@pluto.rain.com To: ml@netfence.it Message-Id: <4e2e4359.Bqcxgx6o90aaXsM4%perryh@pluto.rain.com> References: <4E2CB198.9010601@netfence.it> <4E2CBCAB.1070209@dichotomia.fr> <4e2d77ab.MMEk62U6kU+dlZeX%perryh@pluto.rain.com> <4E2D6BD7.4030500@netfence.it> In-Reply-To: <4E2D6BD7.4030500@netfence.it> User-Agent: nail 11.25 7/29/05 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: freebsd-questions@freebsd.org Subject: Re: ATA troubles X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 25 Jul 2011 21:39:59 -0000 Andrea Venturoli wrote: > On 07/25/11 16:03, perryh@pluto.rain.com wrote: > > I fixed a similar problem -- involving a VIA 6421 controller -- > > a while back, by using atacontrol(8) to reduce the DMA speed > > from UDMA133 to UDMA100. > ... > I don't know if this is really effective with SATA... Nor do I; my problem involved a PATA device. Dmesg reports for SATA devices include a UDMAxx notation in addition to the SATA speed notation, but I don't know its significance. ad0: 305245MB at ata0-master UDMA66 ad1: 32253MB at ata0-slave UDMA66 ad4: 61136MB at ata2-master UDMA100 SATA 1.5Gb/s acd1: DVDR at ata3-master UDMA66 SATA 1.5Gb/s ad8: 305245MB at ata4-master UDMA133