From owner-freebsd-questions Thu Feb 14 13:47: 6 2002 Delivered-To: freebsd-questions@freebsd.org Received: from post.mail.nl.demon.net (post-11.mail.nl.demon.net [194.159.73.21]) by hub.freebsd.org (Postfix) with ESMTP id BFCE137B405 for ; Thu, 14 Feb 2002 13:47:00 -0800 (PST) Received: from [212.238.194.207] (helo=mailhost.raggedclown.net) by post.mail.nl.demon.net with esmtp (Exim 3.33 #1) id 16bTiU-000K7L-00; Thu, 14 Feb 2002 21:46:58 +0000 Received: from angel.raggedclown.net (angel.raggedclown.intra [192.168.1.7]) by mailhost.raggedclown.net (Ragged Clown Mail Gateway [buffy]) with ESMTP id 0E83213040; Thu, 14 Feb 2002 22:46:57 +0100 (CET) Received: by angel.raggedclown.net (Ragged Clown Host [angel], from userid 1001) id 1516D225BC; Thu, 14 Feb 2002 22:46:58 +0100 (CET) Date: Thu, 14 Feb 2002 22:46:58 +0100 From: Cliff Sarginson To: vanya Cc: freebsd-questions@FreeBSD.ORG Subject: DMA on ATAPI CD's [ Was Re: About printers ] Message-ID: <20020214214657.GB347@raggedclown.net> References: <000801be3bd9$b17799e0$942a2cc2@og> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000801be3bd9$b17799e0$942a2cc2@og> User-Agent: Mutt/1.3.27i Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Sat, Jan 09, 1999 at 05:09:35PM +0300, vanya wrote: (Best to keep unrelated questions in seperate posts). > And one question about DMA for EIDE disks and ATAPI CD. Is DMA automatically > enabled or user must turn on this option? I believe DMA is not enabled on ATAPI CD devices, I believe it is considered a source of possible instability in certain cases (I know of no proof for this..) .. you can forceably re-enable it by an entry in sysctl.conf. I have 2 IDE i/faces, with a hard drive and a CD/DVD on one slave and a CD R/W on another. My line looks as follows: hw.atamodes=dma,dma,dma,dma You will need to adjust this according to your actual IDE setup, (i.e. how your ide's are actually configured)... "man 8 sysctl.conf" may help. -- Regards Cliff To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message