Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753064AbXFAV6S (ORCPT ); Fri, 1 Jun 2007 17:58:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751267AbXFAV6G (ORCPT ); Fri, 1 Jun 2007 17:58:06 -0400 Received: from mx.laposte.net ([81.255.54.16]:7437 "EHLO mx.laposte.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751426AbXFAV6F convert rfc822-to-8bit (ORCPT ); Fri, 1 Jun 2007 17:58:05 -0400 Date: Fri, 1 Jun 2007 23:57:41 +0200 Message-Id: Subject: Re: Device hang when offlining a CPU due to IRQ misrouting MIME-Version: 1.0 X-Sensitivity: 3 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8BIT From: =?iso-8859-1?b?RW1tYW51ZWwgRnVzdOk=?= To: "djwong" , "ebiederm" Cc: "linux-kernel" X-XaM3-API-Version: 4.1 (B103) X-SenderIP: 127.0.0.1 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1279 Lines: 35 > There exists a similar scenario. Set the IRQ affinity to a bunch of > CPUs, watch /proc/interrupts to see which CPU is actually servicing the > interrupts, then offline that CPU. The kernel does not reroute the IRQ > to any of the other CPUs and the device also hangs. > > The furthest that I've dug is that it works on 2.6.17 and is broken in > 2.6.22-rc3 and 2.6.21. Will git-bisect further, but I wanted to know if > anyone else has seen this sort of problem. afaik, this seems to happen > with both IOAPIC and MSI interrupts, possibly more. Hi, As a side note, on my very old SMP machine, 2.6.20 correctly load-balance IRQs across CPU but 2.6.21 not. I know that in-kernel IRQ load balancer is marked as deprecated and somewhat broken, but with your report it make me think it could be a bug in the IRQ rerouting part in my case too and not necessary in the load-balancer (decision) part. Emmanuel. --- Cr?ez votre adresse ?lectronique prenom.nom@laposte.net 1 Go d'espace de stockage, anti-spam et anti-virus int?gr?s. - 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/