Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750949AbXAaP2A (ORCPT ); Wed, 31 Jan 2007 10:28:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751401AbXAaP2A (ORCPT ); Wed, 31 Jan 2007 10:28:00 -0500 Received: from srv5.dvmed.net ([207.36.208.214]:57689 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750949AbXAaP17 (ORCPT ); Wed, 31 Jan 2007 10:27:59 -0500 Message-ID: <45C0B570.4000000@garzik.org> Date: Wed, 31 Jan 2007 10:27:44 -0500 From: Jeff Garzik User-Agent: Thunderbird 1.5.0.9 (X11/20061219) MIME-Version: 1.0 To: Ingo Molnar CC: Linus Torvalds , Stephen Hemminger , Thomas Gleixner , Andrew Morton , Linux Kernel Mailing List Subject: Re: Linux 2.6.20-rc6 - sky2 resume breakage References: <20070129144055.151cfe52@freekitty> <20070129154518.40b0b3d3@freekitty> <20070129161626.33277eb1@freekitty> <20070130065457.GA23390@elte.hu> <45BEF61F.7000400@garzik.org> <20070130075325.GA591@elte.hu> <45BEFBB2.8090402@garzik.org> <20070130080830.GC2840@elte.hu> In-Reply-To: <20070130080830.GC2840@elte.hu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -4.3 (----) X-Spam-Report: SpamAssassin version 3.1.7 on srv5.dvmed.net summary: Content analysis details: (-4.3 points, 5.0 required) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1158 Lines: 27 Ingo Molnar wrote: > * Jeff Garzik wrote: > >> Easy to name an example, as they are pretty generic. When sharing >> irqs -- usually ATA is configured to PCI native (IO-APIC-fasteoi) -- >> any interrupt storm causes the other devices sharing that irq to crap >> themselves (kernel turns off irq, suggests irqpoll, etc.) > > ok. Can you suggest any way for me to reproduce such a bug artificially > on a test system? [i have both old and new systems, so if you can think > of a way for me to trigger this i'd be happy to try] Should be pretty easy. With either the old-IDE driver or libata, complete a command without acknowledging an interrupt. For libata, that means poking around in ata_host_intr() and avoiding well-built hardware like AHCI. Anything that uses ata_piix driver, basically all Intel machines, should be applicable in the "not well built" category... :) 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/