From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: Problem with KVM-84 and more than 4 processors Date: Mon, 09 Mar 2009 12:01:32 +0200 Message-ID: <49B4E8FC.9000701@redhat.com> References: <49AD43C6.2080407@tu-berlin.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Matthias Hovestadt Return-path: Received: from mx2.redhat.com ([66.187.237.31]:35840 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752733AbZCIKBn (ORCPT ); Mon, 9 Mar 2009 06:01:43 -0400 In-Reply-To: <49AD43C6.2080407@tu-berlin.de> Sender: kvm-owner@vger.kernel.org List-ID: Matthias Hovestadt wrote: > Hi! > > I have a system with 2 processors and 4 cores each, which sums > up to 8 processors in total. I installed the system with Gentoo.2008 > and KVM-84. > > Linux asok04 2.6.27-gentoo-r8 #1 SMP Tue Mar 3 11:34:26 CET 2009 > x86_64 Intel(R) Xeon(R) CPU X5355 @ 2.66GHz GenuineIntel GNU/Linux > > Everything is running fine as long as I do not change the default > setting of CONFIG_NR_CPUS=4 in the kernel config: > That's the host kernel, right? > asok04 ~ # lsmod > Module Size Used by > kvm_intel 39176 1 > kvm 137072 1 kvm_intel > scsi_wait_scan 1664 0 > asok04 ~ # > > All KVM modules are loaded and I'm perfectly able to start and use > virtual guests. > > However, if I increase CONFIG_NR_CPUS to any number higher than 4, the > additional processors of my system are listed in /proc/cpuinfo, but > this is the output of lsmod: > > asok04 ~ # lsmod > Module Size Used by > kvm 137072 283728377 > scsi_wait_scan 1664 0 > asok04 ~ # > > Manually loading the kvm_intel module fails with an "Cannot allocate > memory" error. Also starting VMs fails since he is unable to find > /dev/kvm. Looks like a memory corruption issue. Please post your .config. -- error compiling committee.c: too many arguments to function