From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755202Ab1LZLlY (ORCPT ); Mon, 26 Dec 2011 06:41:24 -0500 Received: from mx1.redhat.com ([209.132.183.28]:45782 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754980Ab1LZLlT (ORCPT ); Mon, 26 Dec 2011 06:41:19 -0500 Message-ID: <4EF85D50.8000204@redhat.com> Date: Mon, 26 Dec 2011 13:41:04 +0200 From: Avi Kivity User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111115 Thunderbird/8.0 MIME-Version: 1.0 To: Nikunj A Dadhania 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 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> In-Reply-To: <87d3bbtvnw.fsf@linux.vnet.ibm.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/26/2011 01:33 PM, Nikunj A Dadhania wrote: > On Mon, 26 Dec 2011 11:05:01 +0200, Avi Kivity wrote: > > On 12/26/2011 05:14 AM, Nikunj A Dadhania wrote: > > > > > > > > btw you can get an additional speedup by enabling x2apic, for > > > > default_send_IPI_mask_logical(). > > > > > > > In the host? > > > > > > > In the host, > > > The machine(IBM x3650 M2, Nehalem) does not seem to support x2apic. It's emulated. > 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. -- error compiling committee.c: too many arguments to function