Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 10 Apr 2002 10:04:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 10 Apr 2002 10:04:39 -0400 Received: from ns1.advfn.com ([212.161.99.144]:57872 "EHLO mail.advfn.com") by vger.kernel.org with ESMTP id ; Wed, 10 Apr 2002 10:04:39 -0400 Message-Id: <200204101404.g3AE4bs30567@mail.advfn.com> Content-Type: text/plain; charset=US-ASCII From: Tim Kay Reply-To: timk@advfn.com Organization: Advfn.com To: linux-kernel@vger.kernel.org Subject: Re: how to balance interrupts between 2 CPUs? Date: Wed, 10 Apr 2002 15:06:50 +0100 X-Mailer: KMail [version 1.3.2] In-Reply-To: MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Using a poweredge XXXXX with apic enabled (the default) will give you CPU interrupt sharing: CPU0 CPU1 0: 34977278 34950769 IO-APIC-edge timer 1: 1 1 IO-APIC-edge keyboard 2: 0 0 XT-PIC cascade 14: 5 1 IO-APIC-edge ide0 16: 149330778 149335816 IO-APIC-level eth0 30: 2975700 2977038 IO-APIC-level aic7xxx 31: 7 9 IO-APIC-level aic7xxx NMI: 0 0 LOC: 69933245 69933202 ERR: 0 MIS: 0 but /var/log/messages will overflow with APIC errors and your machine will eventually (in my exp) die as it stops answering the interrupt requests so you should stick to append="noapic" in your lilo.conf or whatever. The above is happening to us on PE 1550s 2450s & 6400s anyway. I believe that, unless you are running single CPU hogging apps on a one per processor basis, you dont lose a great deal with one processor dealing with the IRQs and the other(s) running the software. Tim On Wednesday 10 Apr 2002 13:23, zxj@water.pku.edu.cn wrote: > Hello > > I am using two Intel Giga NICs in a DELL PowerEdge 4600 > with 2 Intel XEON 1.8GHz CPUs. > The matherboard is ServerWorks GC-HE. > The OS is RedHat 7.2, and the release of kernel is "2.4.7-10smp". > > The CPU0 has very heavy interrupt traffic, > you can see the following information: > > [root@giga root]# cat /proc/interrupts > CPU0 CPU1 > 0: 395117 0 IO-APIC-edge timer > 1: 653 0 IO-APIC-edge keyboard > 2: 0 0 XT-PIC cascade > 8: 1 0 IO-APIC-edge rtc > 12: 23 0 IO-APIC-edge PS/2 Mouse > 14: 2 0 IO-APIC-edge ide0 > 18: 30 0 IO-APIC-level aic7xxx > 19: 86013 0 IO-APIC-level eth0 > 20: 10394 0 IO-APIC-level aic7xxx > 21: 30 0 IO-APIC-level aic7xxx > 27: 5480873 0 IO-APIC-level e1000 > 39: 164889152 0 IO-APIC-level e1000 > NMI: 0 0 > LOC: 395013 395012 > ERR: 0 > MIS: 0 > > > The kernel's SMP option is enable, but the CPU1 is always idle. > How to balance the interrpupts between two CPUs? > If you are convenient, please give me some advice quickly. > > Thank you! > > Best regard > > > - > 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/ -- ---------------- Tim Kay systems administrator Advfn.com Plc - http://www.advfn.com/ timk@advfn.com Tel: 020 7070 0941 Fax: 020 7070 0959 - 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/