Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266409AbTGEQx2 (ORCPT ); Sat, 5 Jul 2003 12:53:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266410AbTGEQx2 (ORCPT ); Sat, 5 Jul 2003 12:53:28 -0400 Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:449 "EHLO www.linux.org.uk") by vger.kernel.org with ESMTP id S266409AbTGEQx0 (ORCPT ); Sat, 5 Jul 2003 12:53:26 -0400 Message-ID: <3F0705E1.2090200@pobox.com> Date: Sat, 05 Jul 2003 13:07:45 -0400 From: Jeff Garzik Organization: none User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20021213 Debian/1.2.1-2.bunk X-Accept-Language: en MIME-Version: 1.0 To: Ryan Mack CC: Markus Plail , linux-kernel@vger.kernel.org Subject: Re: 2.4.21 ServerWorks DMA Bugs References: <87fzllh21i.fsf@gitteundmarkus.de> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 488 Lines: 16 Ryan Mack wrote: > That at least explains the lack of DMA, but why does non-DMA IO result in > such significant clock skew? Sounds like the kernel is disabling interrupts for a long time, when doing PIO data transfer (non-DMA IO). Jeff - 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/