Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266291AbTGEHGI (ORCPT ); Sat, 5 Jul 2003 03:06:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266292AbTGEHGH (ORCPT ); Sat, 5 Jul 2003 03:06:07 -0400 Received: from moutng.kundenserver.de ([212.227.126.189]:41410 "EHLO moutng.kundenserver.de") by vger.kernel.org with ESMTP id S266291AbTGEHGG (ORCPT ); Sat, 5 Jul 2003 03:06:06 -0400 To: linux-kernel@vger.kernel.org Subject: Re: 2.4.21 ServerWorks DMA Bugs X-Face: 8omYku?tAexGd1v,5cQg?N#5RsX"8\+(X=8o[ Ve)k4kR)7DN3VM-`_LiF(jfij'tPzNFf|MK|vL%Z9_#[ssfD[=mFaBy]?VV0&vLi09Jx*:)CVQJ*e3 Oyv%0J(}_6 From: Markus Plail Date: Sat, 05 Jul 2003 09:21:13 +0200 In-Reply-To: (Ryan Mack's message of "Fri, 4 Jul 2003 23:45:29 -0700 (PDT)") Message-ID: <87fzllh21i.fsf@gitteundmarkus.de> User-Agent: Gnus/5.1002 (Gnus v5.10.2) Emacs/21.3.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1209 Lines: 27 On Fri, 4 Jul 2003, Ryan Mack wrote: > I've real the other threads but nothing touches on my specific issue. > I have a dual P4 Xeon Dell PowerEdge 1600SC with a Fusion MPT SCSI > controller and a ServerWorks CSB5 IDE chipset. All the HDs are on the > SCSI bus, and only my CD reader and my DVD writer are on the IDE bus > (one on each channel). Hyperthreading is enabled (4 logical > processors). I am using GCC 3.2.2. > > The CD readers is the blacklisted 'SAMSUNG CD-ROM SC-148C' and I never > use it so I can remove it if needed. The DVD writer is a 'SONY DVD RW > DRU-500A'. Both are going through the ide-scsi driver. Whenever I > read/write CDs in the DVD writer, I get very high system load (50% on > one CPU), even though DMA seems to be enabled. If you are writing CDs with unusual block sizes (audio CDs, (S)VCDs, RAW mode -> blocksize != 2048) you won't get DMA with ide-scsi, no matter what you do. It's simply not supported. regards Markus - 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/