From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?B?RMOibmllbA==?= Fraga Subject: Re: ICH10 not working with AHCI kernel option Date: Fri, 9 Apr 2010 06:12:52 -0300 Message-ID: <4bbeef97.6202be0a.13e4.166e@mx.google.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> <4BBE6CA6.1010808@gmail.com> <20100409100833.666f64f1@lxorguk.ukuu.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit Return-path: Received: from mail-yw0-f194.google.com ([209.85.211.194]:58886 "EHLO mail-yw0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754074Ab0DIJM5 (ORCPT ); Fri, 9 Apr 2010 05:12:57 -0400 Received: by ywh32 with SMTP id 32so363747ywh.33 for ; Fri, 09 Apr 2010 02:12:56 -0700 (PDT) In-Reply-To: <20100409100833.666f64f1@lxorguk.ukuu.org.uk> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Alan Cox Cc: Robert Hancock , linux-ide@vger.kernel.org On Fri, 9 Apr 2010 10:08:33 +0100 Alan Cox wrote: > You also don't get the CPU having to handle each command itself and poke > the drive which causes signficiant stalls (doubly so because Jeff Garzik > hasn't applied my patches to fix the bogus ones yet ;)) > > So not only do you get 64bit DMA and NCQ but the inter command delay is > lower so its faster overall. You also get less CPU stalls for I/O which > can be very slow with legacy mode although it usually only upsets real > time people. Interesting. With my old motherboard (sata_nv) I used to have some stalls, mainly on GTK+ apps like Claws-mail during intense I/O and Firefox. Now with AHCI it's barely noticeable, but it happens too, although not as frequent as it used to happen with sata_nv. I hope your patches get applied soon. --