From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752117AbWCOWZx (ORCPT ); Wed, 15 Mar 2006 17:25:53 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752119AbWCOWZw (ORCPT ); Wed, 15 Mar 2006 17:25:52 -0500 Received: from mail.dvmed.net ([216.237.124.58]:36746 "EHLO mail.dvmed.net") by vger.kernel.org with ESMTP id S1752117AbWCOWZw (ORCPT ); Wed, 15 Mar 2006 17:25:52 -0500 Message-ID: <44189468.6000201@garzik.org> Date: Wed, 15 Mar 2006 17:25:44 -0500 From: Jeff Garzik User-Agent: Mozilla Thunderbird 1.0.7-1.1.fc4 (X11/20050929) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Ingo Molnar CC: Lee Revell , "Bill Rugolsky Jr." , Andi Kleen , Jason Baron , linux-kernel@vger.kernel.org, john stultz Subject: Re: libata/sata_nv latency on NVIDIA CK804 [was Re: AMD64 X2 lost ticks on PM timer] References: <200602280022.40769.darkray@ic3man.com> <4408BEB5.7000407@garzik.org> <20060303234330.GA14401@ti64.telemetry-investments.com> <200603040107.27639.ak@suse.de> <20060315213638.GA17817@ti64.telemetry-investments.com> <1142459152.1671.64.camel@mindpipe> <20060315215848.GB18241@elte.hu> <20060315220046.GA20469@elte.hu> In-Reply-To: <20060315220046.GA20469@elte.hu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: 0.0 (/) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Ingo Molnar wrote: > so my guess would be that this device doesnt do MMIO, and the PIO inb() > causes some bad BIOS-based SMM handler/emulator to trigger, which takes > 16.6 msecs. If indeed the device is not in MMIO mode, is there a way to > force it into MMIO mode, to test this theory? Yes, but that carries with it an entirely new programming set, to use MMIO: http://marc.theaimsgroup.com/?l=linux-ide&m=114124501116060&w=2 Not like NICs, where you can just point it at another PCI BAR. Jeff