From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Lord Subject: Re: Controlling PATA access speeds Date: Fri, 02 Jun 2006 18:33:06 -0400 Message-ID: <4480BCA2.1050707@rtr.ca> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from rtr.ca ([64.26.128.89]:22415 "EHLO mail.rtr.ca") by vger.kernel.org with ESMTP id S932584AbWFBWdG (ORCPT ); Fri, 2 Jun 2006 18:33:06 -0400 In-Reply-To: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: John Treubig Cc: dwm@austin.ibm.com, jeff@garzik.org, linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org John Treubig wrote: > Because of my setup, I have had to pull pin 34 (PDIAG) high at the > Promise to make the Promise think I have a 40 pin cable. At boot, the > Promise thinks I have a 40 wire cable installed and gives me a warning, > yet when I run my program that measures transfer rate in Linux, I still > see the same data rates as with an 80 wire cable (pin 34 shorted). What data rate is that? If it's less than 25MB/sec (or so), then the udma mode won't make much of a difference either way. Cheers