From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753001Ab1L0Bvu (ORCPT ); Mon, 26 Dec 2011 20:51:50 -0500 Received: from e28smtp03.in.ibm.com ([122.248.162.3]:43070 "EHLO e28smtp03.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751834Ab1L0Bvp (ORCPT ); Mon, 26 Dec 2011 20:51:45 -0500 From: Nikunj A Dadhania To: Avi Kivity Cc: Ingo Molnar , peterz@infradead.org, linux-kernel@vger.kernel.org, vatsa@linux.vnet.ibm.com, bharata@linux.vnet.ibm.com Subject: Re: [RFC PATCH 0/4] Gang scheduling in CFS In-Reply-To: <4EF85D50.8000204@redhat.com> References: <20111219083141.32311.9429.stgit@abhimanyu.in.ibm.com> <20111219112326.GA15090@elte.hu> <87sjke1a53.fsf@abhimanyu.in.ibm.com> <4EF1B85F.7060105@redhat.com> <877h1o9dp7.fsf@linux.vnet.ibm.com> <20111223103620.GD4749@elte.hu> <4EF701C7.9080907@redhat.com> <87vcp4t45p.fsf@linux.vnet.ibm.com> <4EF838BD.60406@redhat.com> <87d3bbtvnw.fsf@linux.vnet.ibm.com> <4EF85D50.8000204@redhat.com> User-Agent: Notmuch/0.10.2+70~gf0e0053 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-redhat-linux-gnu) Date: Tue, 27 Dec 2011 07:17:35 +0530 Message-ID: <87aa6eu6o8.fsf@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii x-cbid: 11122701-3864-0000-0000-000000AEB849 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 26 Dec 2011 13:41:04 +0200, Avi Kivity wrote: > On 12/26/2011 01:33 PM, Nikunj A Dadhania wrote: > > > I have enabled the following in my config; > > > > [root@krm1 linux-tip]# grep X2APIC .config > > CONFIG_X86_X2APIC=y > > [root@krm1 linux-tip]# > > > > And booted the kernel with "apic=verbose" command. > > > > [root@krm1 linux-tip]# dmesg | grep -i x2apic > > [root@krm1 linux-tip]# > > > > Does not give anything. I safely assumed that x2apic is not > > supported. Is there something to do in the bios to enable this? > > Sorry, I was imprecise. Boot the guest, it will recognize the emulated > x2apic. > I booted the guest with -cpu ...,+x2apic (using libvirt), and verified that qemu command-line does contain x2apic. There is a log saying this: Using CPU model "Nehalem,+rdtscp,+x2apic,+dca,+xtpr,+tm2,+est,+vmx,+ds_cpl,+monitor,+pbe,+tm,+ht,+ss,+acpi,+ds,+vme" Though in the guest dmesg, I still do not see any x2apic logs. I am missing something obvious here. Regards Nikunj