From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264935AbTLFCtf (ORCPT ); Fri, 5 Dec 2003 21:49:35 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264938AbTLFCtf (ORCPT ); Fri, 5 Dec 2003 21:49:35 -0500 Received: from mail-01.iinet.net.au ([203.59.3.33]:5254 "HELO mail.iinet.net.au") by vger.kernel.org with SMTP id S264935AbTLFCtc (ORCPT ); Fri, 5 Dec 2003 21:49:32 -0500 Message-ID: <3FD14396.5070205@cyberone.com.au> Date: Sat, 06 Dec 2003 13:48:54 +1100 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030827 Debian/1.4-3 X-Accept-Language: en MIME-Version: 1.0 To: William Lee Irwin III CC: Colin Coe , linux-kernel@vger.kernel.org Subject: Re: SMP broken on Dell PowerEdge 4100/200 under 2.6.0-testxx? References: <3350.192.168.1.3.1070677965.squirrel@www.coesta.com> <20031206024251.GG8039@holomorphy.com> In-Reply-To: <20031206024251.GG8039@holomorphy.com> 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 William Lee Irwin III wrote: >On Sat, Dec 06, 2003 at 10:32:45AM +0800, Colin Coe wrote: > >>This indicates to me that the processing load is being evenly distributed >>accross the two processes. Under v2.6.0-testxx however, 'cat >>/proc/interrupts' shows this: >>[root@host root]# cat /proc/interrupts >> CPU0 CPU1 >> 0: 633122 30 IO-APIC-edge timer >> 1: 207 IO-APIC-edge i8042 >> 2: XT-PIC cascade >> 4: 48 1 IO-APIC-edge serial >> 5: 449 1 IO-APIC-level eth1 >> 10: 135 1 IO-APIC-level aic7xxx >> 11: 1447 1 IO-APIC-level eth0 >> 12: 61 IO-APIC-edge i8042 >> 14: IO-APIC-level CS46XX >> 15: 14982 1 IO-APIC-level megaraid >> > >2.6 does balancing across packages, not logical cpus, so this will >happen and it will be largely harmless, except for what appears to >be some kind of bug where it's stealing the timer from logical cpu 1. > > Although in this case Colin has 2 PPro 200s. Colin - process load should be evenly distributed between CPUs, and this is generally the most important thing. Big networking loads (most commonly) can put a lot of time into processing interrupts though.