Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932436Ab0APE5k (ORCPT ); Fri, 15 Jan 2010 23:57:40 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758983Ab0APE5j (ORCPT ); Fri, 15 Jan 2010 23:57:39 -0500 Received: from mail-iw0-f197.google.com ([209.85.223.197]:54796 "EHLO mail-iw0-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757378Ab0APE5i convert rfc822-to-8bit (ORCPT ); Fri, 15 Jan 2010 23:57:38 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=D016+yr3Ut2Nq6lag7PFACsq4SD/aPt7EAzIN8umWZgMXnSCMgvb02KMO9lp8KAhmx 7yo8QveBj93X7WiBtySkYKOdR0TwiCEb+pXZI/KFr4K4MP+AhQSysv+LlGKW5Ohf8SEP jZFS8OcLAza5sq+Oy1w69bV3e2edhAiUh+19w= MIME-Version: 1.0 In-Reply-To: <20100116030257.GG3814@khazad-dum.debian.net> References: <201001121700.18234.seth.heasley@intel.com> <4B4D4EAA.2010109@gmail.com> <4B4DAA68.60608@pobox.com> <51f3faa71001131611y343ad225n1acc73900fd49894@mail.gmail.com> <51f3faa71001131642u2cc9de80n8e73be7a8707afb2@mail.gmail.com> <20100114201136.GA3814@khazad-dum.debian.net> <51f3faa71001141615k3223a02fhb0b882b6cbe680cf@mail.gmail.com> <20100116030257.GG3814@khazad-dum.debian.net> Date: Fri, 15 Jan 2010 22:57:37 -0600 Message-ID: <51f3faa71001152057n66524711x316ac055d3043625@mail.gmail.com> Subject: Re: [PATCH 2.6.32.3] ahci: AHCI and RAID mode SATA patch for Intel Cougar Point DeviceIDs From: Robert Hancock To: Henrique de Moraes Holschuh Cc: Jeff Garzik , Seth Heasley , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jan 15, 2010 at 9:02 PM, Henrique de Moraes Holschuh wrote: > On Thu, 14 Jan 2010, Robert Hancock wrote: >> > Maybe it is the silicon AHCI in ICH6R that is immature, and one is much >> > better of using it in IDE mode? >> >> That seems unlikely, since the Intel-provided Matrix Storage drivers >> for that controller on Windows will be using AHCI mode.. > > That doesn't say much. > > If the change doesn't risk switching unaware users from IDE mode to AHCI, it > is not a problem. ?But if it does, why risk it? ?It is not like anyone that > wants hotplug and has an ICH6-R/M system won't have figured it out by now > how to get it to use AHCI, these are NOT new systems. > > AHCI in ICH6R or ICH6M is not always an advantage. ?You don't want it on > ICH6-M in a laptop if it is not going to use the hotplug, for example. ?In > AHCI mode, the chip draws more power. Well, the ICH6M seems to be stuck in whatever mode the user and/or BIOS designer has stuck it in,so nothing would change with it, only with the ICH6R which is not a mobile chipset. I'm not sure about using more power in the controller in AHCI mode, but in IDE mode, you can't use SATA link power saving, which is likely just as significant. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/