From owner-freebsd-questions@FreeBSD.ORG Fri May 30 10:04:41 2003 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0BC4537B401 for ; Fri, 30 May 2003 10:04:41 -0700 (PDT) Received: from rutger.owt.com (rutger.owt.com [204.118.6.16]) by mx1.FreeBSD.org (Postfix) with ESMTP id AFD6743F3F for ; Fri, 30 May 2003 10:04:39 -0700 (PDT) (envelope-from kstewart@owt.com) Received: from topaz-out (owt-207-41-94-233.owt.com [207.41.94.233]) by rutger.owt.com (8.11.6p2/8.9.3) with ESMTP id h4UH4bD32158; Fri, 30 May 2003 10:04:37 -0700 From: Kent Stewart To: Rich Morin , freebsd-questions@freebsd.org Date: Fri, 30 May 2003 10:04:39 -0700 User-Agent: KMail/1.5.2 References: <200305300729.41685.kstewart@owt.com> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200305301004.39445.kstewart@owt.com> Subject: Re: Boot problem: "ata0: resetting devices" X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 May 2003 17:04:41 -0000 On Friday 30 May 2003 09:50 am, Rich Morin wrote: > At 7:29 AM -0700 5/30/03, Kent Stewart wrote: > >I use the Promise TX2 and Maxtor pci cards in several systems. I > >just dropped them in and they worked. You would have to boot scsi. > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > So, you're saying that I can't boot from an ATA drive on a PCI-based > controller card? What is the background for this limitation? No, you didn't understand. The ATA cards appear like a scsi to the bios. To boot from an add in ATA card, you have to choose scsi boot. > > Also, I'm curious about the effects of turning off hw.ata.ata_dma; > outside of using some CPU time, what are the likely effects of this. > For instance, is this likely to slow down disk transfers, assuming > that the system is mostly idle? You lose a lot of speed. My new ATA cards are all UDMA-133. Dma transfers are always faster. PIO is set at something like 16MB/s. You only get so many milliseconds of time for a each transfer block and dma is always faster. Kent -- Kent Stewart Richland, WA http://users.owt.com/kstewart/index.html