Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758591AbXEaWn6 (ORCPT ); Thu, 31 May 2007 18:43:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753323AbXEaWnv (ORCPT ); Thu, 31 May 2007 18:43:51 -0400 Received: from rtr.ca ([64.26.128.89]:4940 "EHLO mail.rtr.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752241AbXEaWnu (ORCPT ); Thu, 31 May 2007 18:43:50 -0400 Message-ID: <465F4FA2.8030200@rtr.ca> Date: Thu, 31 May 2007 18:43:46 -0400 From: Mark Lord User-Agent: Thunderbird 2.0.0.0 (X11/20070326) MIME-Version: 1.0 To: Jeff Garzik Cc: Daniel J Blueman , bzolnier@gmail.com, linux-ide@vger.kernel.org, Linux Kernel , Alan Cox Subject: Re: Compact Flash performance... References: <6278d2220705301510y2d81f69eu38fb778d32de05e1@mail.gmail.com> <465E3FF0.9010709@rtr.ca> <6278d2220705310222rde9ad28ndfd8feced84a3c6f@mail.gmail.com> <465EBE20.6090803@rtr.ca> <6278d2220705311025q6ee030e2kd44b7302a50ac902@mail.gmail.com> <465F360D.6020603@rtr.ca> <6278d2220705311439x40f7b1c1l7cef54acd2e8fcea@mail.gmail.com> <465F4D4E.6050305@rtr.ca> <465F4E20.5080503@garzik.org> In-Reply-To: <465F4E20.5080503@garzik.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 952 Lines: 23 Jeff Garzik wrote: > Mark Lord wrote: >> Some cards may perform better when their "memory" interface is used >> instead of the "I/O" interface, or vice-versa. I'm not sure which >> of the two methods was selected by libata (probably the "memory" >> interface). > > I am very CF-ignorant. How does libata select a memory or I/O interface > on a CF device? Right. Usually we cannot select them, as it's the wires between the ATA chipset (motherboard) and the CFCARD that determine this. So I suppose this means that most implementations are using the I/O access method, except for some embedded systems where the CFCARD is wired to the host bus without a separate "controller" chip in between. Cheers - 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/