Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 4 Sep 2002 11:41:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 4 Sep 2002 11:41:36 -0400 Received: from rom.cscaper.com ([216.19.195.129]:18347 "HELO mail.cscaper.com") by vger.kernel.org with SMTP id ; Wed, 4 Sep 2002 11:41:34 -0400 Subject: Re: IDE-DVD problems [excuse former idiotic topic] Content-Transfer-Encoding: 7BIT To: Benjamin LaHaise From: "Joseph N. Hall" Cc: Matthew Dharm , linux-kernel@vger.kernel.org Content-Type: text/plain; charset=US-ASCII Mime-version: 1.0 Date: Wed, 4 Sep 2002 08:48 -0700 X-mailer: Mailer from Hell v1.0 Message-Id: <20020904154134Z319183-685+42704@vger.kernel.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3241 Lines: 82 On Wed, 4 Sep 2002 10:55:37 -0400, Benjamin LaHaise wrote: > Have you tried commenting out the hdparm commands in the initscripts and > booted with a kernel that enables DMA (instead of using hdparm -d1)? > > -ben I can give that a whirl, but it bothers me the way it currently "works": * Performance is terrible * booting with noapic makes no difference * Performance seems to indicate some kind of difficulties in the kernel, perhaps connected to interrupt handling I have another RH 7.3 box sitting next to the new one, which has a Sony DVD-ROM. I just enabled DMA with hdparm and it works very well. That is not what happens on the other (troublesome) machine. So I am wondering: * Kernel interrupt handling problem (should there be ERR if apic is enabled? which it is) * IRQ problem? I haven't tried changing around IRQs. * IDE controller problem? Probably not, because the drive seems to work the same on the Highpoint controller. * Problem with this specific drive? Perhaps. I've never used it before--the last "combo" drive I used was SCSI. I bought this one because it was the same brand as the SCSI drive I used before, and as an IDE device it would be about $500 cheaper (no SCSI card needed). I will check to see if a firmware download is available. * Some other m/b problem? Perhaps, but I've not tried this drive in another box. I am inclined to try that next. I am also inclined to try the Sony DVD-ROM in the new box to see if it exhibits the same behavior. What is the "combo drive" used by the iMac et al.? -joseph > > On Tue, Sep 03, 2002 at 11:00:00PM -0700, Joseph N. Hall wrote: > > Yes, DMA makes the drive completely non functional and eventually > > hangs the machine after some amount of attempted use. This is > > regardless of when DMA is enabled, whether via the standard > > RedHat "harddiskn" mechanism or manually with hdparm. > > > > -joseph > > > > On Tue, 3 Sep 2002 22:37:57 -0700, Matthew Dharm wrote: > > > > > > Have you tried enabling DMA on the drive? > > > > > > Matt > > > > > > On Tue, Sep 03, 2002 at 06:45:00PM -0700, Joseph N. Hall wrote: > > > > Dear Kernel Folks, > > > > > > > > I am trying to determine the cause of the poor performance of a > > > > an IDE DVD device on my new machine. I have an IDE Panasonic DF-210-type > > > > DVD-RAM/R/ROM in a new machine with Soyo KT333 motherboard. It > > > > transfers data slowly (below DVD speed), consumes large amounts of > > > > system time, and slows down the user interface and even system > > > > clock (which can run as slow as 1/4 speed while the drive is > > > > going). > > > > > > > > The interrupt ERR count below seems to be mostly related to use > > > > of the DVD drive. > > > > > > > > Maybe it's something simple. If not, I'll be glad to do further > > > > work to help diagnose the problem. > > -- > "You will be reincarnated as a toad; and you will be much happier." > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/