From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Cox Subject: Re: Slow hard drives Date: Wed, 31 Oct 2007 10:38:43 +0000 Message-ID: <20071031103843.3a3dd374@the-village.bc.nu> References: <1193784294.5955.2.camel@jimin-desktop> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Received: from outpipe-village-512-1.bc.nu ([81.2.110.250]:49013 "EHLO the-village.bc.nu" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1753802AbXJaKhC (ORCPT ); Wed, 31 Oct 2007 06:37:02 -0400 In-Reply-To: <1193784294.5955.2.camel@jimin-desktop> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Ben Court Cc: linux-ide@vger.kernel.org > The same comes up for hdb (i have two hard drives installed) and those 3 > messages repeat for a while and then this comes up > > Oct 30 20:45:41 jimin-desktop kernel: [ 69.256000] hda: DMA disabled > > Oct 30 20:45:41 jimin-desktop kernel: [ 69.592000] ide0: reset: success The kernel switches from DMA to PIO (slow) when it finds that the DMA isn't working properly - its attempting to keep the box running rather than just dying What controller ?