From owner-freebsd-stable Tue Jun 25 22: 3: 4 2002 Delivered-To: freebsd-stable@freebsd.org Received: from topperwein.dyndns.org (acs-24-154-28-203.zoominternet.net [24.154.28.203]) by hub.freebsd.org (Postfix) with ESMTP id 8B60F37B400 for ; Tue, 25 Jun 2002 22:03:00 -0700 (PDT) Received: from topperwein (topperwein [192.168.168.10]) by topperwein.dyndns.org (8.12.3/8.12.3) with ESMTP id g5Q52xLq013583 for ; Wed, 26 Jun 2002 01:02:59 -0400 (EDT) (envelope-from behanna@zbzoom.net) Date: Wed, 26 Jun 2002 01:02:54 -0400 (EDT) From: Chris BeHanna Reply-To: Chris BeHanna To: FreeBSD-Stable Subject: Re: Another Q about hw.ata.atapi_dma In-Reply-To: <20020621085334.A1165@sheol.localdomain> Message-ID: <20020626010026.Y13148-100000@topperwein.dyndns.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Fri, 21 Jun 2002, D J Hawkey Jr wrote: > Hi. > > OK, so I boot, hit the spacebar, and enter 'set hw.ata.atapi_dma="1"', > and 'boot'. The sysctl setting takes: > > [sheol] ~$ sysctl -a |grep dma > hw.ata.ata_dma: 1 > hw.ata.atapi_dma: 1 > hw.atamodes: dma,---,pio,pio, > > And/but dmesg still shows (correspondingly): > > ... > acd0: CD-RW at ata1-master using PIO3 > acd1: CDROM at ata1-slave using PIO4 > ... > > Does this mean the hardware doesn't support DMA, or am I looking at the > wrong thing to see that it is using DMA? The drives do function. Some of them the drives lie about supporting DMA. FWIW, I've had good luck with DMA with Creative Labs, Hitachi, and Lite-On products. The latter in particular provide awesome bang for the buck, with a product available that does 16x8x40x for CD-R, CD-RW, and reading CDs, respectively, for under $90 US if you shop around. -- Chris BeHanna Software Engineer (Remove "bogus" before responding.) behanna@bogus.zbzoom.net Turning coffee into software since 1990. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message