From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Shtylyov Subject: Re: [RFC][PATCH] at91_ide driver Date: Sat, 17 Jan 2009 23:08:21 +0300 Message-ID: <49723AB5.7000809@ru.mvista.com> References: <200901141345.42583.stf_xl@wp.pl> <20090114131727.5b0e5193@lxorguk.ukuu.org.uk> <49708C55.1020204@ru.mvista.com> <200901161603.03699.stf_xl@wp.pl> <4970A8FF.4080404@ru.mvista.com> <20090116161342.4229667f@lxorguk.ukuu.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from gateway-1237.mvista.com ([63.81.120.155]:10717 "EHLO imap.sh.mvista.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1754314AbZAQUIf (ORCPT ); Sat, 17 Jan 2009 15:08:35 -0500 In-Reply-To: <20090116161342.4229667f@lxorguk.ukuu.org.uk> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Alan Cox Cc: Stanislaw Gruszka , Andrew Victor , Nicolas Ferre , Haavard Skinnemoen , linux-ide@vger.kernel.org, Bartlomiej Zolnierkiewicz , ddaney@caviumnetworks.com Hello. Alan Cox wrote: >> the PIO transfer speeds (very significantly) though I'm not sure of the >> current state of affairs... >> > > 16bit only performance is identical (as you'd expect) Well, I don't know what to expect, having seen figures like 0.5 (or 1.5) MB/s cited on this list... > 32bit is now > identical with the 32bit pio patches applied > Hm, I didn't realize 32-bit I/O really can really boost the IDE speed. I vaguely remember (or misremember) benchmarking drives under DOS (many years ago) with and without 32-bit access enabled in the BIOS Setup and not seeing any significant differences. Perhpas it's worth to re-benchmark this in Linux if I find the time... MBR, Sergei