From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Scholz Subject: Re: Impact of no_lba48{_dma} = 1 ? Date: Wed, 07 Feb 2007 15:03:07 +0100 Message-ID: <45C9DC1B.2070602@imc-berlin.de> 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=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from mail.imc-berlin.de ([217.110.46.186]:60908 "EHLO mx1.imc-berlin.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161315AbXBGODK (ORCPT ); Wed, 7 Feb 2007 09:03:10 -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: Sergei Shtylyov , linux-ide@vger.kernel.org Alan wrote: > On Wed, 07 Feb 2007 16:49:44 +0300 > Sergei Shtylyov wrote: > >> 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. Ok: I rephrase my question: Could it be that my HDD behaves strangly (i.e. doing hda: status timeout: status=0xd0 { Busy } ide: failed opcode was: unknown hda: no DRQ after issuing MULTWRITE_EXT ide0: unexpected interrupt, status=0x80, count=1 ide0: reset: success ) sometimes when rqsize is set to 65536 altough I only do PIO transfer? Steven