From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Hancock Subject: Re: ICH10 not working with AHCI kernel option Date: Thu, 08 Apr 2010 17:54:14 -0600 Message-ID: <4BBE6CA6.1010808@gmail.com> References: <20100408144525.2f3f5718@lxorguk.ukuu.org.uk> <4bbdde49.e302be0a.3106.0220@mx.google.com> <20100408145916.50dbe8de@lxorguk.ukuu.org.uk> <4bbde1ea.c701be0a.60ec.0270@mx.google.com> <20100408150920.5689564b@lxorguk.ukuu.org.uk> <4bbde4f7.1702be0a.5f6c.028e@mx.google.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-gy0-f174.google.com ([209.85.160.174]:42421 "EHLO mail-gy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933823Ab0DHXyS (ORCPT ); Thu, 8 Apr 2010 19:54:18 -0400 Received: by gyg13 with SMTP id 13so1469707gyg.19 for ; Thu, 08 Apr 2010 16:54:17 -0700 (PDT) In-Reply-To: <4bbde4f7.1702be0a.5f6c.028e@mx.google.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: =?ISO-8859-1?Q?D=E2niel_Fraga?= Cc: Alan Cox , linux-ide@vger.kernel.org On 04/08/2010 08:15 AM, D=E2niel Fraga wrote: > On Thu, 8 Apr 2010 15:09:20 +0100 > Alan Cox wrote: > >> Yes > > Ok, problem solved. You're right, the BIOS option was wrong. > The problem is that it's called "RAID mode" and I found it not > intuitive since I don't use RAID (so I didn't touch it). I changed it > from IDE to AHCI and it worked. > > So just a quick and last question. I read here the following: > > http://forum-en.msi.com/index.php?topic=3D106575.120 > > "AHCI is a native SATA Mode. There is not necessarely a major > performance difference between IDE/Legacy Mode and AHCI Mode". > > Of course this guy is talking about Windows, but can it be > applied to Linux too? I mean, does AHCI offers no significant > performance improvement over SFF/Legacy mode? Depends on a lot of things, and what you mean by "significant". You=20 don't get NCQ in legacy mode, and you also don't get 64-bit DMA support= ,=20 which gets more significant the more RAM you have.