From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: [PATCH 6/8] libata: adjust speed down rules Date: Wed, 28 Nov 2007 17:30:02 +0900 Message-ID: <474D270A.6030102@gmail.com> References: <11961593392491-git-send-email-htejun@gmail.com> <11961593403415-git-send-email-htejun@gmail.com> <474C9B10.4060500@rtr.ca> <474CA31E.4000508@gmail.com> <474CA94E.9080603@rtr.ca> <474CA9C4.9040902@gmail.com> <474CC017.3040305@rtr.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from qb-out-0506.google.com ([72.14.204.226]:33184 "EHLO qb-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751402AbXK1Ia2 (ORCPT ); Wed, 28 Nov 2007 03:30:28 -0500 Received: by qb-out-0506.google.com with SMTP id e11so1520920qbe for ; Wed, 28 Nov 2007 00:30:26 -0800 (PST) In-Reply-To: <474CC017.3040305@rtr.ca> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Mark Lord Cc: jeff@garzik.org, linux-ide@vger.kernel.org, bzolnier@gmail.com Hello, Mark. Mark Lord wrote: > Last question: what about CD/DVD writers? > > Are the data-out commands for those done via block, or via SG_IO ? > (my memory fails me here). > > Do they ever get speed up/down based on WRITE errors ? That depends on how the writing commands are issued. If the commands are issued via SG_IO (which is the case for wodim and probably for others too), it won't affect speed down. If the commands are issued by writing to /dev/sr0, it will. Thanks. -- tejun