Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756147AbXFBFKd (ORCPT ); Sat, 2 Jun 2007 01:10:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753376AbXFBFKV (ORCPT ); Sat, 2 Jun 2007 01:10:21 -0400 Received: from 1wt.eu ([62.212.114.60]:2807 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751570AbXFBFKU (ORCPT ); Sat, 2 Jun 2007 01:10:20 -0400 Date: Sat, 2 Jun 2007 07:10:06 +0200 From: Willy Tarreau To: Mark Lord Cc: Jeff Garzik , Daniel J Blueman , bzolnier@gmail.com, linux-ide@vger.kernel.org, Linux Kernel , Alan Cox Subject: Re: Compact Flash performance... Message-ID: <20070602051005.GQ943@1wt.eu> 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> <465F4FA2.8030200@rtr.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <465F4FA2.8030200@rtr.ca> User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1071 Lines: 27 On Thu, May 31, 2007 at 06:43:46PM -0400, Mark Lord wrote: > 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. CF cards support 3 modes (MEM, I/O and True IDE), and neither MEM nor I/O modes can talk IDE. Most often, the PIN 9 is simply shorted to the ground at the connector to set the card in True IDE mode, which makes it emulate a standard IDE disk. Cheers, Willy - 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/