From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: 64 bit guest much faster ? Date: Sun, 25 Oct 2009 07:41:24 +0200 Message-ID: <4AE3E504.2080608@redhat.com> References: <4AE1D1A4.6050001@pms.ifi.lmu.de> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Stefan Return-path: Received: from mx1.redhat.com ([209.132.183.28]:9584 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752709AbZJYFlX (ORCPT ); Sun, 25 Oct 2009 01:41:23 -0400 In-Reply-To: <4AE1D1A4.6050001@pms.ifi.lmu.de> Sender: kvm-owner@vger.kernel.org List-ID: On 10/23/2009 05:54 PM, Stefan wrote: > Hello, > > I have a simple question (sorry I'm a kvm beginner): > Is it right that a 64bit guest (8 CPUs, 16GB) is > much faster than a 32bit guest (8 CPUs, 16GB PAE). > (kvm guest and kvm host are Ubuntu 9.04, 2.6.28-15-server, > kvm 1:84+dfsg-0ubuntu12.3). eg "dpkg-reconfigure initramfs-tools" > runs twice as fast on the 64bit guest. > > There shouldn't be that much of a difference. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic.