Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 19 Mar 2001 14:23:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 19 Mar 2001 14:22:51 -0500 Received: from dfw-smtpout2.email.verio.net ([129.250.36.42]:53894 "EHLO dfw-smtpout2.email.verio.net") by vger.kernel.org with ESMTP id ; Mon, 19 Mar 2001 14:22:37 -0500 Message-ID: <3AB65C51.3DF150E5@bigfoot.com> Date: Mon, 19 Mar 2001 11:21:53 -0800 From: Tim Moore Organization: Yoyodyne Propulsion Systems, Inc. X-Mailer: Mozilla 4.75 [en] (X11; U; Linux 2.2.19pre17 i686) X-Accept-Language: en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Re: UDMA 100 / PIIX4 question In-Reply-To: <20010318165246Z131240-406+1417@vger.kernel.org> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org quintaq@yahoo.co.uk wrote: > I have an IBM DTLA 307030 (ATA 100 / UDMA 5) on an 815e board (Asus CUSL2), which has a PIIX4 controller. > ... > My problem is that (according to hdparm -t), I never get a better transfer rate than approximately 15.8 Mb/sec. I achieve this when DMA is enabled, - without it I fall back to about 5 Mb /sec. No amount of fiddling with other hdparm settings makes any difference. > ... 15MB/s for hdparm is about right. "...four IDE devices can be supported in Bus Master mode. PIIX4 contains support for "Ultra DMA/33" synchronous DMA compatible devices." http://developer.intel.com/design/intarch/techinfo/440BX/PIIX4_intro.htm -- - 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/