From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262554AbVAKEIj (ORCPT ); Mon, 10 Jan 2005 23:08:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262549AbVAKEHv (ORCPT ); Mon, 10 Jan 2005 23:07:51 -0500 Received: from fmr23.intel.com ([143.183.121.15]:39897 "EHLO scsfmr003.sc.intel.com") by vger.kernel.org with ESMTP id S262393AbVAKEFK (ORCPT ); Mon, 10 Jan 2005 23:05:10 -0500 Date: Mon, 10 Jan 2005 20:04:25 -0800 From: "Siddha, Suresh B" To: Andi Kleen Cc: Yinghai Lu , "'Mikael Pettersson'" , jamesclv@us.ibm.com, Matt_Domsch@dell.com, discuss@x86-64.org, linux-kernel@vger.kernel.org, suresh.b.siddha@intel.com Subject: Re: 256 apic id for amd64 Message-ID: <20050110200425.B30630@unix-os.sc.intel.com> References: <20050110184437.GA74665@muc.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <20050110184437.GA74665@muc.de>; from ak@muc.de on Mon, Jan 10, 2005 at 07:44:37PM +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org YH, I suggest you root cause the exact issue and if it turns out to be a platform issue, then we can have a kernel workaround for that specific platform. As Andi mentioned, we don't have any kernel limitations with BSP apicid != 0. On Mon, Jan 10, 2005 at 07:44:37PM +0100, Andi Kleen wrote: > On Mon, Jan 10, 2005 at 10:32:42AM -0800, Yinghai Lu wrote: > > Case 1: lift core0/node0 to use 16, and core1/node0 to use 17..... > > Case 2: core0/node0-->0, core1/node0-->1, core0/node1-->18, > > core1/node1-->19... > > Case 3: core0/node0-->0, core1/node0-->17, core0/node1-->18, > > core1/node1-->19... > > > > Case 1 will make jiffies not happy and it will hang on calibrate_dalay. ( > > jiffies is not changing). > > That's because it needs physical APIC mode to handle CPU IDs >7, and that is > not implemented in the flat case. I added it now, but you likely don't need > it anyways. Andi, we don't need physical APIC mode just to handle CPU APIC ID's > 7 when the total number of cpu's in the system is < 8. Right? thanks, suresh