From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933408AbXGZIhv (ORCPT ); Thu, 26 Jul 2007 04:37:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1765801AbXGZIgL (ORCPT ); Thu, 26 Jul 2007 04:36:11 -0400 Received: from smtp4-g19.free.fr ([212.27.42.30]:36307 "EHLO smtp4-g19.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761203AbXGZIgI (ORCPT ); Thu, 26 Jul 2007 04:36:08 -0400 Message-ID: <46A85CE9.7070506@free.fr> Date: Thu, 26 Jul 2007 10:35:53 +0200 From: John Sigler User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.8) Gecko/20061108 SeaMonkey/1.0.6 MIME-Version: 1.0 To: Len Brown CC: Ingo Molnar , linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Pin-pointing the root of unusual application latencies References: <469600F7.3060603@free.fr> <20070725133835.GA17616@elte.hu> <46A758B5.9070602@free.fr> <200707251309.54240.lenb@kernel.org> In-Reply-To: <200707251309.54240.lenb@kernel.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Len Brown wrote: > John Sigler wrote: > >> # cat /proc/interrupts >> CPU0 >> 0: 37 XT-PIC-XT timer >> 1: 2 XT-PIC-XT i8042 >> 2: 0 XT-PIC-XT cascade >> 7: 0 XT-PIC-XT acpi >> 10: 175 XT-PIC-XT eth2, Dta1xx >> 11: 1129 XT-PIC-XT eth0 >> 12: 4 XT-PIC-XT eth1 >> 14: 21482 XT-PIC-XT ide0 >> NMI: 0 >> LOC: 161632 >> ERR: 0 >> MIS: 0 >> >> IRQ 10 is shared between a NIC and an I/O board. >> >> For eth2, the kernel said: >> ACPI: PCI Interrupt 0000:00:0a.0[A] -> Link [LNKC] >> -> GSI 10 (level, low) -> IRQ 10 >> >> For Dta1xx, the kernel said: >> ACPI: PCI Interrupt 0000:02:0e.0[A] -> Link [LNKC] >> -> GSI 10 (level, low) -> IRQ 10 >> >> Is it possible to avoid the two boards sharing IRQ 10? > > Maybe. In this configuration, INTA of the two devices > is physically connected to the same wire on the device-side > of the interrupt re-mapper -- so you'd have to change the configuration. > If you have an IOAPIC and can enable it, that will not hurt -- I believe this board does not provide an IO-APIC. Even the LAPIC is disabled in the BIOS. (Why would they do that??) > though unless something else changes, these devices are still > tied together on the device-side of the mapper. > So if you can physically move one of the devices to another slot > that is your best bet. I will try. > I'd need a bunch of info from your system to tell you what > you can do ahead of time, including full dmesg, lspci -vv > and acpidump. The motherboard is an Adlink EBC-2000T with 3 on-board Intel 82559 NICs. http://www.adlinktech.com/PD/web/PD_detail.php?pid=213 VIA Pro133T (VT82C694T + VT82C686B) chipset. http://www.viaarena.com/default.aspx?PageID=40&STypeID=12 Kernel config: http://linux.kernel.free.fr/latency/config-2.6.20.7-rt8-adlink-latency dmesg: http://linux.kernel.free.fr/latency/dmesg.adlink lspci: http://linux.kernel.free.fr/latency/lspci.adlink acpidump: http://linux.kernel.free.fr/latency/acpidump.adlink Regards.