From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267431AbUH0Xpz (ORCPT ); Fri, 27 Aug 2004 19:45:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267397AbUH0Xpv (ORCPT ); Fri, 27 Aug 2004 19:45:51 -0400 Received: from snat.supernetwork.cz ([81.31.19.1]:32128 "EHLO lindik.prosek.czf") by vger.kernel.org with ESMTP id S267350AbUH0Xpf (ORCPT ); Fri, 27 Aug 2004 19:45:35 -0400 Message-ID: <412FC7A7.4030100@scssoft.com> Date: Sat, 28 Aug 2004 01:45:43 +0200 From: Petr Sebor Organization: SCS Software User-Agent: Mozilla Thunderbird 0.7.2 (Windows/20040707) X-Accept-Language: en-us, en MIME-Version: 1.0 To: =?ISO-8859-1?Q?Petter_Sundl=F6f?= Cc: linux-kernel@vger.kernel.org Subject: Re: Cannot enable DMA on SATA drive (SCSI-libsata, VIA SATA) References: <412F5D50.7000807@findus.dhs.org> In-Reply-To: <412F5D50.7000807@findus.dhs.org> X-Enigmail-Version: 0.84.2.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Petter Sundlöf wrote: > Using 2.6.8.1. DMA works fine on /dev/hda (PATA, CD burner). > > When I try to enable it for my SATA drive (which is performing horribly > bad -- 80-90% CPU load on an AMD64 3200+ during copy of large files) Hello, just a 'me too' e-mail... I have Master2-FAR mobo, VIA/KT800 chipset. IDE disk runs like a charm but SATA disks consume big amount of cpu time (which is spent in iowait). The system behaves exactly as with old IDE disk and DMA disabled... everything is slow when data is transferred to/from disk. I have played with various settings, io schedulers, acpi... but haven't found anything useful so far.. Regards, Petr