From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Shtylyov Subject: Re: Impact of no_lba48{_dma} = 1 ? Date: Wed, 07 Feb 2007 17:10:52 +0300 Message-ID: <45C9DDEC.508@ru.mvista.com> References: <45C9A23E.3030201@imc-berlin.de> <20070207115826.2e3609e3@localhost.localdomain> <45C9D34E.1060007@imc-berlin.de> <20070207135309.66942d25@localhost.localdomain> <45C9D8F8.2000303@ru.mvista.com> <20070207141149.5c0c709b@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from h155.mvista.com ([63.81.120.155]:34261 "EHLO imap.sh.mvista.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1161322AbXBGOKz (ORCPT ); Wed, 7 Feb 2007 09:10:55 -0500 In-Reply-To: <20070207141149.5c0c709b@localhost.localdomain> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Alan Cc: Steven Scholz , linux-ide@vger.kernel.org Hello. Alan wrote: >>>>>Only relevant for DMA really >>>>So rqsize is only needed for DMA accesses? >> Not really, it affects both PIO and DMA. > Yes but its not relevant. The question was about performance, and your > performance will suck equally with PIO regardless of the request size > limit. Performace would suck even more with the single sector transfers. :-) > Alan MBR, Sergei