From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: [PATCH #upstream-fixes] sata_mv: don't issue two DMA commands concurrently Date: Wed, 13 Aug 2008 20:52:19 +0900 Message-ID: <48A2CAF3.2010009@gmail.com> References: <489C19CE.6030708@ngs.ru> <489C4B6E.9070306@rtr.ca> <489C4F29.6020007@rtr.ca> <489C54D1.5080901@rtr.ca> <48A29E14.3090908@gmail.com> <48A2BBDC.2090201@ngs.ru> <48A2BC5D.5060801@gmail.com> <48A2C35C.7020400@ngs.ru> <48A2C460.6040504@gmail.com> <48A2C9BC.2010209@ngs.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from ti-out-0910.google.com ([209.85.142.191]:36713 "EHLO ti-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752577AbYHMLxR (ORCPT ); Wed, 13 Aug 2008 07:53:17 -0400 Received: by ti-out-0910.google.com with SMTP id b6so1524548tic.23 for ; Wed, 13 Aug 2008 04:53:16 -0700 (PDT) In-Reply-To: <48A2C9BC.2010209@ngs.ru> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Artem Bokhan Cc: Jeff Garzik , Mark Lord , linux-ide@vger.kernel.org Artem Bokhan wrote: > Tejun Heo =D0=BF=D0=B8=D1=88=D0=B5=D1=82: >> Unfortunately, libata core layer isn't ready for >> this yet and spews ugly warning message and malfunctions on this. When NCQ is disabled, it will probably add tiny bit to inter command latency thus reducing performance a bit but I don't think it will stand out in any way. When you count in the seek time and all, the inter command latency should be negligible in most cases. --=20 tejun