From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: KVM and the OOM-Killer Date: Thu, 13 May 2010 16:53:17 +0300 Message-ID: <4BEC044D.4070004@redhat.com> References: <4BEBEE8F.9050508@jrcs.co.uk> <4BEBF2F8.7020507@redhat.com> <4BEC0121.2020700@jrcs.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: James Stevens Return-path: Received: from mx1.redhat.com ([209.132.183.28]:55704 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752863Ab0EMNxi (ORCPT ); Thu, 13 May 2010 09:53:38 -0400 In-Reply-To: <4BEC0121.2020700@jrcs.co.uk> Sender: kvm-owner@vger.kernel.org List-ID: On 05/13/2010 04:39 PM, James Stevens wrote: >> I'd go with 64-bit at 2GB and above. It's both faster and safer. > > safer, how? (apart from no lowmem exhaust). Nothing apart from that (well, if you run nonpae you lose NX protection). > > On a different subject, the qemu documentation says a guest VM can > only have 2Gb of memory - does this still apply when using a 64bit > host O/S ? The documentation is outdated. > >> Since you can run a 64-bit kernel with your existing userspace, at least >> you have a simple upgrade path. > > Not sure I like the idea of running a 64bit user space kernel on top > of a 32bit host, prefer to re-install. > > Can I just replace my kernel with a 64bit one, or do I have to > re-install the host O/S ? You can run 32-bit userspace with a 64-bit kernel, or reinstall, whichever you prefer. I once upgraded a 32-bit Fedora install to 64-bit, but that takes some tinkering. -- error compiling committee.c: too many arguments to function