From owner-freebsd-stable@FreeBSD.ORG Fri Nov 30 15:21:15 2007 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id EF37116A419 for ; Fri, 30 Nov 2007 15:21:15 +0000 (UTC) (envelope-from kometen@gmail.com) Received: from an-out-0708.google.com (an-out-0708.google.com [209.85.132.246]) by mx1.freebsd.org (Postfix) with ESMTP id A918813C469 for ; Fri, 30 Nov 2007 15:21:15 +0000 (UTC) (envelope-from kometen@gmail.com) Received: by an-out-0708.google.com with SMTP id c14so568514anc for ; Fri, 30 Nov 2007 07:21:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; bh=I8NrHGADFAUIrMgfe/zUDuuDDxzXIoFIYNblHUHcPnM=; b=XTj5BxnFquN98Ofp/n1/lTvBxuTCpfaF2Cl2qvQvt8rUVxVj0RQsDfH/ySL5h+Gx6b7LVUq4UvKiNcdLfpFMcUfgfjx8+OzWanmq4CYhZ3KQh4mD4hLzPTey1BYc1CCmNS8x/KypgneIY5/fs9ijta7hclDEcvnM8nvyh5X9Gpo= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=F+s8nJOXoPDgLNbF8nzNX8as5/iY65B6wrNh+Ua1ZJYnBH0jmlrT6GhtWw9Z2M+QX5tGA/alblzip3Aw94aRHU5umNaSVvEG+37Kj51lBS9vi+i/rRLoIm308lS8hexPblZOUEaPuQR1We/e/UXOJFamibS+4V5GeYlQNKU3XyE= Received: by 10.100.106.1 with SMTP id e1mr14448222anc.1196436075006; Fri, 30 Nov 2007 07:21:15 -0800 (PST) Received: by 10.100.228.15 with HTTP; Fri, 30 Nov 2007 07:21:14 -0800 (PST) Message-ID: Date: Fri, 30 Nov 2007 16:21:14 +0100 From: "Claus Guttesen" To: "Pete French" In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <474FD17D.7080209@FreeBSD.org> Cc: max@love2party.net, kris@freebsd.org, freebsd-stable@freebsd.org Subject: Re: Also seeing 2 x quad-core system slower that 2 x dual core X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Nov 2007 15:21:16 -0000 > > Yes, if the claim is that the hardware is absolutely identical apart > > from one having two quad-core CPUs instead of two dual-core, the next > > step is to disable half of the CPUs and confirm that the problem goes away. > > Just comming back to this today, will do a side by side compare of the dmesg > later to make sure that they *are* identical as claimed, but the idea of > disabling half the CPU's is an excellent one! > > Aha, brilliant idea! > > > Check dmesg for the APIC numbers corresponding to the CPUs you want to > > disable and add the corresponding entries to /boot/loader.conf, e.g.: > > You mean this bit? > > FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs > cpu0 (BSP): APIC ID: 0 > cpu1 (AP): APIC ID: 1 > cpu2 (AP): APIC ID: 2 > cpu3 (AP): APIC ID: 3 > cpu4 (AP): APIC ID: 4 > cpu5 (AP): APIC ID: 5 > cpu6 (AP): APIC ID: 6 > cpu7 (AP): APIC ID: 7 For completeness sake :-) you could try to disable the second quad-core-cpu completely rather than 2 cores on each unit and redo the test. -- regards Claus When lenity and cruelty play for a kingdom, the gentlest gamester is the soonest winner. Shakespeare