Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262169AbVDFLmV (ORCPT ); Wed, 6 Apr 2005 07:42:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262170AbVDFLmU (ORCPT ); Wed, 6 Apr 2005 07:42:20 -0400 Received: from alog0122.analogic.com ([208.224.220.137]:49302 "EHLO chaos.analogic.com") by vger.kernel.org with ESMTP id S262169AbVDFLmM (ORCPT ); Wed, 6 Apr 2005 07:42:12 -0400 Date: Wed, 6 Apr 2005 07:41:36 -0400 (EDT) From: "Richard B. Johnson" Reply-To: linux-os@analogic.com To: Julien Wajsberg cc: linux-kernel@vger.kernel.org Subject: Re: How's the nforce4 support in Linux? In-Reply-To: <2a0fbc59050405155815666e8d@mail.gmail.com> Message-ID: References: <2a0fbc59050325145935a05521@mail.gmail.com> <2a0fbc5905040506422fbf6356@mail.gmail.com> <2a0fbc59050405155815666e8d@mail.gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3583 Lines: 78 On Tue, 5 Apr 2005, Julien Wajsberg wrote: > On Apr 5, 2005 4:10 PM, Richard B. Johnson wrote: >> On Tue, 5 Apr 2005, Julien Wajsberg wrote: >> >>> On Mar 26, 2005 12:59 AM, Julien Wajsberg wrote: >>>> I own an Asus A8N-Sli motherboard with the Nforce4-Sli chipset, and I >>>> experiment the following problem : >>>> >>>> Mar 25 22:42:55 evenflow kernel: hda: dma_timer_expiry: dma status == 0x60 >>>> Mar 25 22:42:55 evenflow kernel: hda: DMA timeout retry >>>> Mar 25 22:42:55 evenflow kernel: hda: timeout waiting for DMA >>>> Mar 25 22:42:55 evenflow kernel: hda: status error: status=0x58 { >>>> DriveReady SeekComplete DataRequest } >>>> Mar 25 22:42:55 evenflow kernel: >>>> Mar 25 22:42:55 evenflow kernel: ide: failed opcode was: unknown >>>> Mar 25 22:42:55 evenflow kernel: hda: drive not ready for command >>>> Mar 25 22:42:55 evenflow kernel: hda: status timeout: status=0xd0 { Busy } >>>> Mar 25 22:42:55 evenflow kernel: >>>> Mar 25 22:42:55 evenflow kernel: ide: failed opcode was: unknown >>>> Mar 25 22:42:55 evenflow kernel: hdb: DMA disabled >> ^^^^^^^^^^^^^^^^^ >>>> Mar 25 22:42:55 evenflow kernel: hda: drive not ready for command >>>> >>>> Of course, if I disable DMA with hdparm, this problem disappear.. but >>>> it isn't a long-term solution ;-) >>>> >> >> The long-term solution is to replace either the drive, cable, or the >> motherboard that can't do DMA. > It's a recent drive that did ultra DMA on another motherboard, and a > recent motherboard with a cable that did ultra DMA before.It was ultra > DMA2 on this old motherboard, but it still was ultra DMA. > >> A bad DMA operation can write data >> anywhere (right into the middle of the kernel). There isn't >> anything software can do about it. Software sets up the >> controller for a DMA operation, then waits for an interrupt >> that tells it has completed or failed. Software can retry failed >> operations until software gets destroyed by the hardware, but >> there isn't anything else that can be done. >> >> The fact that disabling DMA makes the problem(s) go away is >> proof that it isn't a software problem. There are flash-RAM >> devices that emulate IDE drives. Most of these can't do DMA >> and the IDE driver doesn't accept that fact. That is a known >> bug. One needs to use hdparm to tell it to stop trying to >> use DMA. In your case, the driver stopped using DMA when >> it found out that it didn't work. There is no bug. > > In my case, the driver stopped for hdb, that is my dvd-burner/player. > It did nothing for hda or hdc, I had to disable DMA myself. > > Will I have to install Windows XP to prove ultra DMA works correctly > on this setup ? I really don't hope... How would you know? Windows will just run it as PIOW and be done with it. Did you ever try to copy a large file in XP? Try it. Try the same thing in linux on the same hardware. You don't need a stop-watch. On Win-XP, a 10 megabyte file (hardly large) takes about 10 seconds. That's 1 megabyte/second. Linux tries to be a bit faster. > > -- > Julien > Cheers, Dick Johnson Penguin : Linux version 2.6.11 on an i686 machine (5537.79 BogoMips). Notice : All mail here is now cached for review by Dictator Bush. 98.36% of all statistics are fiction. - 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/